diff --git a/data/modules/mainmenu/menustate.lua b/data/modules/mainmenu/menustate.lua
index 830df232..2fbc9a26 100644
--- a/data/modules/mainmenu/menustate.lua
+++ b/data/modules/mainmenu/menustate.lua
@@ -16,6 +16,6 @@ end
 -- here is where everything starts
 if not initialStateLoaded then
     onEnterMenuState()
-    App.setOnClose(onApplicationClose)
+    App.onClose = onApplicationClose
     initialStateLoaded = true
 end
diff --git a/data/modules/messagebox/messagebox.lua b/data/modules/messagebox/messagebox.lua
index 44540e8b..307384c6 100644
--- a/data/modules/messagebox/messagebox.lua
+++ b/data/modules/messagebox/messagebox.lua
@@ -1,9 +1,11 @@
+function autoDestroyParent()
+    self.parent:destroy()
+end
+
 function messageBox(title, text)
-    local msgbox = UI.load("modules/messagebox/messagebox.yml")
-    local label = msgbox:getChildById("messageBoxLabel")
-    local okButton = msgbox:getChildById("messageBoxOkButton")
-    msgbox.locked = true
-    msgbox.title = title
-    label.text = text
-    okButton.onClick = function() msgbox:destroy() end
+    local msgBox = UI.load("modules/messagebox/messagebox.yml")
+    msgBox.locked = true
+    msgBox.title = title
+    msgBox:child("textLabel").text = text
+    msgBox:child("okButton").onClick = autoDestroyParent
 end
diff --git a/data/modules/messagebox/messagebox.yml b/data/modules/messagebox/messagebox.yml
index 640f9bd3..81a04e47 100644
--- a/data/modules/messagebox/messagebox.yml
+++ b/data/modules/messagebox/messagebox.yml
@@ -4,12 +4,12 @@ window#messageBoxWindow:
   anchors.verticalCenter: parent.verticalCenter
 
 
-  label#messageBoxLabel:
+  label#textLabel:
     anchors.horizontalCenter: parent.horizontalCenter
     anchors.top: parent.top
     margin.top: 27
 
-  button#messageBoxOkButton:
+  button#okButton:
     text: Ok
     size: [43, 20]
     anchors.right: parent.right
diff --git a/src/framework/core/configs.h b/src/framework/core/configs.h
index 7d592883..ea27b3c3 100644
--- a/src/framework/core/configs.h
+++ b/src/framework/core/configs.h
@@ -44,7 +44,7 @@ public:
     void setValue(const std::string &key, bool value);
     void setValue(const std::string &key, int value);
 
-    const std::string &getString(const std::string &key) const;
+    const std::string& getString(const std::string &key) const;
     float getFloat(const std::string &key) const;
     bool getBoolean(const std::string &key) const;
     int getInteger(const std::string &key) const;
diff --git a/src/framework/core/engine.cpp b/src/framework/core/engine.cpp
index 0befc46d..f6b4dae0 100644
--- a/src/framework/core/engine.cpp
+++ b/src/framework/core/engine.cpp
@@ -30,6 +30,7 @@
 #include <graphics/fonts.h>
 #include <ui/uicontainer.h>
 #include <net/connection.h>
+#include <script/luascript.h>
 
 Engine g_engine;
 
@@ -116,10 +117,12 @@ void Engine::run()
     m_stopping = false;
     m_running = false;
 
+    g_lua.collectGarbage();
+
     // destroy root ui
     rootContainer->destroy();
 
-    // poll remaning ui events
+    // poll remaning events
     g_engine.poll();
 }
 
@@ -130,8 +133,7 @@ void Engine::stop()
 
 void Engine::onClose()
 {
-    if(m_onCloseCallback)
-        g_dispatcher.addTask(m_onCloseCallback);
+    g_dispatcher.addTask(boost::bind(&LuaScript::callModuleField, &g_lua, "App", "onClose"));
 }
 
 void Engine::onResize(const Size& size)
diff --git a/src/framework/core/engine.h b/src/framework/core/engine.h
index 0b3ff78e..6f964e43 100644
--- a/src/framework/core/engine.h
+++ b/src/framework/core/engine.h
@@ -63,16 +63,12 @@ public:
     /// Return the current ticks on this frame
     int getCurrentFrameTicks() const { return m_lastFrameTicks; }
 
-    void setOnClose(SimpleCallback onCloseCallback) { m_onCloseCallback = onCloseCallback; }
-
 private:
     bool m_stopping;
     bool m_running;
     bool m_calculateFps;
 
     int m_lastFrameTicks;
-
-    SimpleCallback m_onCloseCallback;
 };
 
 extern Engine g_engine;
diff --git a/src/framework/graphics/textarea.h b/src/framework/graphics/textarea.h
index 12554497..2c9db573 100644
--- a/src/framework/graphics/textarea.h
+++ b/src/framework/graphics/textarea.h
@@ -53,7 +53,7 @@ public:
     void appendCharacter(char c);
     void removeCharacter(bool right);
 
-    const std::string& getText() const { return m_text; }
+    std::string getText() const { return m_text; }
 
     Font *getFont() const { return m_font; }
     int getTextPos(Point pos);
diff --git a/src/framework/script/luafunctions.cpp b/src/framework/script/luafunctions.cpp
index a5da8c72..8736d8ee 100644
--- a/src/framework/script/luafunctions.cpp
+++ b/src/framework/script/luafunctions.cpp
@@ -34,40 +34,44 @@ void registerLuaFunctions()
 {
     // App
     g_lua.registerModule("App");
-    g_lua.registerMemberFunction("App", "exit", &lua_App_exit);
-    g_lua.registerMemberFunction("App", "setOnClose", &lua_App_setOnClose);
+    g_lua.registerMemberFunction("exit", &lua_App_exit);
 
     // UI
-    g_lua.registerModule("UI");
-    g_lua.registerMemberFunction("UI", "load", &lua_UI_load);
-    g_lua.registerMemberFunction("UI", "getRootContainer", &lua_UI_getRootContainer);
+    g_lua.registerClass("UI");
+    g_lua.registerMemberFunction("load", &lua_UI_load);
+    g_lua.registerMemberFunction("getRootContainer", &lua_UI_getRootContainer);
 
     // UILayout
     g_lua.registerClass("UILayout");
 
     // UIElement
     g_lua.registerClass("UIElement", "UILayout");
-    g_lua.registerMemberField("UIElement", "onLoad", NULL, &lua_UIElement_setOnLoad);
-    g_lua.registerMemberField("UIElement", "onDestroy", NULL,  &lua_UIElement_setOnDestroy);
-    g_lua.registerMemberField("UIElement", "parent", &lua_UIElement_getParent);
-    g_lua.registerMemberFunction("UIElement", "destroy", &lua_UIElement_destroy);
+    g_lua.registerMemberField("id", &lua_UIElement_getId, &lua_UIElement_setId);
+    g_lua.registerMemberField("enabled", &lua_UIElement_isEnabled, &lua_UIElement_setEnabled);
+    g_lua.registerMemberField("visible", &lua_UIElement_isVisible, &lua_UIElement_setVisible);
+    g_lua.registerMemberField("focused", &lua_UIElement_isFocused, &lua_UIElement_setFocused);
+    g_lua.registerMemberField("parent", &lua_UIElement_getParent, &lua_UIElement_setParent);
+    g_lua.registerMemberField("locked", NULL, &lua_UIElement_setLocked);
+    g_lua.registerMemberFunction("destroy", &lua_UIElement_destroy);
 
     // UIContainer
     g_lua.registerClass("UIContainer", "UIElement");
-    g_lua.registerMemberFunction("UIContainer", "getChildById", &lua_UIContainer_getChildById);
-    g_lua.registerMemberField("UIContainer", "locked", NULL, &lua_UIContainer_setLocked);
+    g_lua.registerMemberFunction("child", &lua_UIContainer_getChild);
+    g_lua.registerMemberFunction("children", &lua_UIContainer_getChildren);
 
     // UILabel
     g_lua.registerClass("UILabel", "UIElement");
-    g_lua.registerMemberField("UILabel", "text", &lua_UILabel_getText, &lua_UILabel_setText);
+    g_lua.registerMemberField("text", &lua_UILabel_getText, &lua_UILabel_setText);
 
     // UIButton
     g_lua.registerClass("UIButton", "UIElement");
-    g_lua.registerMemberField("UIButton", "onClick", NULL, &lua_UIButton_setOnClick);
+
+    // UITextEdit
+    g_lua.registerClass("UITextEdit", "UIElement");
 
     // UIWindow
     g_lua.registerClass("UIWindow", "UIContainer");
-    g_lua.registerMemberField("UIWindow", "title", &lua_UIWindow_getTitle, &lua_UIWindow_setTitle);
+    g_lua.registerMemberField("title", &lua_UIWindow_getTitle, &lua_UIWindow_setTitle);
 }
 
 
@@ -80,12 +84,6 @@ int lua_App_exit()
     return 1;
 }
 
-int lua_App_setOnClose()
-{
-    g_engine.setOnClose(g_lua.createSimpleFuncCallback(g_lua.popFunction()));
-    return 1;
-}
-
 
 ////////////////////////////////////////////////////////////////////////////////
 // UI module
@@ -122,63 +120,92 @@ int lua_UI_getRootContainer()
 ////////////////////////////////////////////////////////////////////////////////
 // UIElement
 
-int lua_UIElement_setOnLoad()
+int lua_UIElement_getId()
 {
-    g_lua.insert(-2);
-    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance())) {
-        int funcRef = g_lua.popFunction();
-        element->associateLuaRef("onLoad", funcRef);
-        element->setOnLoad(g_lua.createScriptableSelfFuncCallback(funcRef));
-    } else
-        g_lua.pop();
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        g_lua.pushString(element->getId());
+    else
+        g_lua.pushNil();
     return 1;
 }
 
-int lua_UIElement_setOnDestroy()
+int lua_UIElement_setId()
 {
-    g_lua.insert(-2);
-    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance())) {
-        int funcRef = g_lua.popFunction();
-        element->associateLuaRef("onDestroy", funcRef);
-        element->setOnDestroy(g_lua.createScriptableSelfFuncCallback(funcRef));
-    }
+    std::string id = g_lua.popString();
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        element->setId(id);
+    return 1;
+}
+
+int lua_UIElement_isEnabled()
+{
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        g_lua.pushBoolean(element->isEnabled());
     else
-        g_lua.pop();
+        g_lua.pushNil();
     return 1;
 }
 
-int lua_UIElement_getParent()
+int lua_UIElement_setEnabled()
 {
+    bool enabled = g_lua.popBoolean();
     if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
-        g_lua.pushClassInstance(element->getParent());
+        element->setEnabled(enabled);
+    return 1;
+}
+
+int lua_UIElement_isVisible()
+{
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        g_lua.pushBoolean(element->isVisible());
     else
         g_lua.pushNil();
     return 1;
 }
 
-int lua_UIElement_destroy()
+int lua_UIElement_setVisible()
 {
+    bool visible = g_lua.popBoolean();
     if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
-        element->destroy();
-    g_dispatcher.addTask(boost::bind(&LuaScript::collectGarbage, &g_lua));
+        element->setVisible(visible);
     return 1;
 }
 
+int lua_UIElement_isFocused()
+{
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        g_lua.pushBoolean(element->isFocused());
+    else
+        g_lua.pushNil();
+    return 1;
+}
 
-////////////////////////////////////////////////////////////////////////////////
-// UIContainer
+int lua_UIElement_setFocused()
+{
+    bool focused = g_lua.popBoolean();
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        element->setFocused(focused);
+    return 1;
+}
 
-int lua_UIContainer_getChildById()
+int lua_UIElement_getParent()
 {
-    std::string id = g_lua.popString();
-    if(UIContainerPtr container = boost::dynamic_pointer_cast<UIContainer>(g_lua.popClassInstance()))
-        g_lua.pushClassInstance(container->getChildById(id));
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        g_lua.pushClassInstance(element->getParent());
     else
         g_lua.pushNil();
     return 1;
 }
 
-int lua_UIContainer_setLocked()
+int lua_UIElement_setParent()
+{
+    UIContainerPtr parent = boost::dynamic_pointer_cast<UIContainer>(g_lua.popClassInstance());
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        element->setParent(parent);
+    return 1;
+}
+
+int lua_UIElement_setLocked()
 {
     bool locked = g_lua.popBoolean();
     if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance())) {
@@ -194,6 +221,42 @@ int lua_UIContainer_setLocked()
     return 1;
 }
 
+int lua_UIElement_destroy()
+{
+    if(UIElementPtr element = boost::dynamic_pointer_cast<UIElement>(g_lua.popClassInstance()))
+        element->destroy();
+    g_dispatcher.addTask(boost::bind(&LuaScript::collectGarbage, &g_lua));
+    return 1;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// UIContainer
+
+int lua_UIContainer_getChild()
+{
+    std::string id = g_lua.popString();
+    if(UIContainerPtr container = boost::dynamic_pointer_cast<UIContainer>(g_lua.popClassInstance()))
+        g_lua.pushClassInstance(container->getChildById(id));
+    else
+        g_lua.pushNil();
+    return 1;
+}
+
+int lua_UIContainer_getChildren()
+{
+    if(UIContainerPtr container = boost::dynamic_pointer_cast<UIContainer>(g_lua.popClassInstance())) {
+        g_lua.newTable();
+        foreach(const UIElementPtr& child, container->getChildren()) {
+            g_lua.pushClassInstance(child);
+            if(child->getId().length())
+                g_lua.setField(child->getId());
+        }
+    } else
+        g_lua.pushNil();
+    return 1;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // UILabel
 
@@ -214,23 +277,6 @@ int lua_UILabel_getText()
     return 1;
 }
 
-
-////////////////////////////////////////////////////////////////////////////////
-// UIButton
-
-int lua_UIButton_setOnClick()
-{
-    g_lua.insert(-2);
-    if(UIButtonPtr button = boost::dynamic_pointer_cast<UIButton>(g_lua.popClassInstance())) {
-        int funcRef = g_lua.popFunction();
-        button->associateLuaRef("onClick", funcRef);
-        button->setOnClick(g_lua.createScriptableSelfFuncCallback(funcRef));
-    } else
-        g_lua.pop();
-    return 1;
-}
-
-
 ////////////////////////////////////////////////////////////////////////////////
 // UIWindow
 
diff --git a/src/framework/script/luafunctions.h b/src/framework/script/luafunctions.h
index 65691d44..da6aec0d 100644
--- a/src/framework/script/luafunctions.h
+++ b/src/framework/script/luafunctions.h
@@ -30,29 +30,39 @@
 
 void registerLuaFunctions();
 
-// global functions
+// App
 int lua_App_exit();
-int lua_App_setOnClose();
 
+// UI
 int lua_UI_load();
 int lua_UI_getRootContainer();
 
 // UIElement
-int lua_UIElement_setOnLoad();
-int lua_UIElement_setOnDestroy();
+int lua_UIElement_getId();
+int lua_UIElement_setId();
+int lua_UIElement_isEnabled();
+int lua_UIElement_setEnabled();
+int lua_UIElement_isVisible();
+int lua_UIElement_setVisible();
+int lua_UIElement_isFocused();
+int lua_UIElement_setFocused();
 int lua_UIElement_getParent();
+int lua_UIElement_setParent();
+int lua_UIElement_setLocked();
 int lua_UIElement_destroy();
+void lua_UIElement_onLoad();
+void lua_UIElement_onDestroy();
 
 // UIContainer
-int lua_UIContainer_getChildById();
-int lua_UIContainer_setLocked();
+int lua_UIContainer_getChild();
+int lua_UIContainer_getChildren();
 
 // UILabel
 int lua_UILabel_setText();
 int lua_UILabel_getText();
 
 // UIButton
-int lua_UIButton_setOnClick();
+void lua_UIButton_onClick();
 
 // UIWindow
 int lua_UIWindow_setTitle();
diff --git a/src/framework/script/luascript.cpp b/src/framework/script/luascript.cpp
index ba75ffac..3b732d52 100644
--- a/src/framework/script/luascript.cpp
+++ b/src/framework/script/luascript.cpp
@@ -26,6 +26,7 @@
 #include <script/luascript.h>
 #include <script/luafunctions.h>
 #include <core/resources.h>
+#include <lua.hpp>
 
 LuaScript g_lua;
 
@@ -82,6 +83,7 @@ bool LuaScript::loadBuffer(const std::string& text, const std::string& what)
 
     // check if is loaded as a function
     if(lua_isfunction(L, -1) == 0) {
+        pop();
         return false;
     }
 
@@ -95,20 +97,20 @@ bool LuaScript::loadBuffer(const std::string& text, const std::string& what)
     return true;
 }
 
-int LuaScript::loadBufferAsFunction(const std::string& text, const std::string& what)
+bool LuaScript::loadBufferAsFunction(const std::string& text, const std::string& what)
 {
     int ret = luaL_loadbuffer(L, text.c_str(), text.length(), what.c_str());
     if(ret != 0){
         reportError(popString());
-        return LUA_REFNIL;
+        return false;
     }
 
-    // check if is loaded as a function
-    if(lua_isfunction(L, -1) == 0) {
-        return LUA_REFNIL;
+    if(!isFunction()) {
+        pop();
+        return false;
     }
 
-    return popFunction();
+    return true;
 }
 
 void LuaScript::reportError(const std::string& errorDesc, const char *funcName)
@@ -117,7 +119,7 @@ void LuaScript::reportError(const std::string& errorDesc, const char *funcName)
     ss << "LUA Script ERROR: ";
     if(funcName)
         ss << " in " << funcName << "(): ";
-    ss << errorDesc << std::endl;
+    ss << errorDesc;
     logError(ss.str());
 }
 
@@ -144,19 +146,156 @@ void LuaScript::insert(int index)
     lua_insert(L, index);
 }
 
-int LuaScript::ref()
+void LuaScript::remove(int index)
 {
-    return luaL_ref(L, LUA_REGISTRYINDEX);
+    lua_remove(L, index);
 }
 
-void LuaScript::unref(int ref)
+void LuaScript::releaseRef(int ref)
 {
     luaL_unref(L, LUA_REGISTRYINDEX, ref);
 }
 
-void LuaScript::getRef(int ref)
+void LuaScript::newTable()
 {
-    lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
+    lua_newtable(L);
+}
+
+void LuaScript::setTable(int index)
+{
+    lua_settable(L, index);
+}
+
+void *LuaScript::newUserdata(int size)
+{
+    return lua_newuserdata(L, size);
+}
+
+void LuaScript::newMetatable(const std::string& name)
+{
+    luaL_newmetatable(L, name.c_str());
+}
+
+void LuaScript::setMetatable(const std::string& name, int index)
+{
+    luaL_getmetatable(L, name.c_str());
+    if(isNil())
+        reportError(f("could not retrive metatable %d", name));
+    else
+        lua_setmetatable(L, index < 0 ? index-1 : index);
+}
+
+void LuaScript::rawGet(const std::string& key)
+{
+    pushString(key);
+    lua_rawget(L, -2);
+}
+
+void LuaScript::rawSet(const std::string& key)
+{
+    pushString(key);
+    insert(-2);
+    lua_rawset(L, -3);
+}
+
+void LuaScript::getField(const std::string& key)
+{
+    lua_getfield(L, -1, key.c_str());
+}
+
+void LuaScript::setField(const std::string& key)
+{
+    lua_setfield(L, -2, key.c_str());
+}
+
+void LuaScript::getScriptableField(const ScriptablePtr& scriptable, const std::string& field)
+{
+    if(scriptable) {
+        pushRef(scriptable->getLuaTableRef());
+        getField(field);
+        remove(-2);
+    } else
+        pushNil();
+}
+
+void LuaScript::setScriptableField(const ScriptablePtr& scriptable, const std::string& field)
+{
+    if(scriptable) {
+        pushRef(scriptable->getLuaTableRef());
+        insert(-2);
+        setField(field);
+    }
+    pop();
+}
+
+void LuaScript::rawGetGlobalTableField(const std::string& globalTable, const std::string& key)
+{
+    getGlobal(globalTable);
+    rawGet(key);
+    remove(-2);
+}
+
+void LuaScript::rawSetGlobalTableField(const std::string& globalTable, const std::string& key)
+{
+    getGlobal(globalTable);
+    insert(-2);
+    rawSet(key);
+    pop();
+}
+
+void LuaScript::getGlobal(const std::string& key)
+{
+    lua_getfield(L, LUA_GLOBALSINDEX, key.c_str());
+}
+
+void LuaScript::setGlobal(const std::string& key)
+{
+    lua_setfield(L, LUA_GLOBALSINDEX, key.c_str());
+}
+
+bool LuaScript::isNil(int index)
+{
+    return lua_isnil(L, index);
+}
+
+bool LuaScript::isBoolean(int index)
+{
+    return lua_isboolean(L, index);
+}
+
+bool LuaScript::isNumber(int index)
+{
+    return lua_isnumber(L, index);
+}
+
+bool LuaScript::isString(int index)
+{
+    return lua_isstring(L, index);
+}
+
+bool LuaScript::isTable(int index)
+{
+    return lua_istable(L, index);
+}
+
+bool LuaScript::isUserdata(int index)
+{
+    return lua_isuserdata(L, index);
+}
+
+bool LuaScript::isFunction(int index)
+{
+    return lua_isfunction(L, index);
+}
+
+bool LuaScript::isCFunction(int index)
+{
+    return lua_iscfunction(L, index);
+}
+
+bool LuaScript::isLuaFunction(int index)
+{
+    return isFunction(index) && !isCFunction(index);
 }
 
 void LuaScript::pop(int n)
@@ -171,7 +310,7 @@ bool LuaScript::popBoolean()
     return b;
 }
 
-int32_t LuaScript::popInteger()
+int LuaScript::popInteger()
 {
     double d = lua_tonumber(L, -1);
     pop();
@@ -187,6 +326,24 @@ std::string LuaScript::popString()
     return str;
 }
 
+ScriptablePtr LuaScript::popClassInstance()
+{
+    ScriptablePtr object;
+    if(isUserdata()) { // instances are store as userdata
+        object = *((ScriptablePtr *)lua_touserdata(L, -1));
+        if(!object)
+            reportErrorWithTraceback("attempt to retrive class instance from a object that is already expired");
+    } else if(!isNil()) // we accept nil values
+        reportErrorWithTraceback("couldn't retrive class instance, the value is not a scriptable type");
+    pop();
+    return object;
+}
+
+int LuaScript::popRef()
+{
+    return luaL_ref(L, LUA_REGISTRYINDEX);
+}
+
 void LuaScript::pushNil()
 {
     lua_pushnil(L);
@@ -207,55 +364,23 @@ void LuaScript::pushString(const std::string& str)
     lua_pushstring(L, str.c_str());
 }
 
-void LuaScript::pushUserdata(void* ptr)
-{
-    lua_pushlightuserdata(L, ptr);
-}
-
-void LuaScript::pushValue(int index)
-{
-    lua_pushvalue(L, index);
-}
-
 void LuaScript::pushClassInstance(const ScriptablePtr& object)
 {
     if(object) {
-        // create weak_ptr to the scriptable object stored as userdata
-        new(lua_newuserdata(L, sizeof(ScriptablePtr))) ScriptablePtr(object);
-        // set object metatable
-        lua_getfield(L, LUA_REGISTRYINDEX, (std::string(object->getScriptableName()) + "_mt").c_str());
-        lua_setmetatable(L, -2);
-    } else {
-        lua_pushnil(L);
-    }
-}
-
-ScriptablePtr LuaScript::popClassInstance()
-{
-    ScriptablePtr object;
-    if(lua_isuserdata(L, -1)) { // instances are store as userdata
-        object = *((ScriptablePtr *)lua_touserdata(L, -1));
-        if(!object)
-            reportErrorWithTraceback("attempt to retrive class instance from a object that is already expired");
-    } else if(!lua_isnil(L, -1)) // we accept nil values
-        reportErrorWithTraceback("couldn't retrive class instance, the value is not a scriptable type");
-    lua_pop(L, 1);
-    return object;
-}
-
-void LuaScript::pushFunction(int functionRef)
-{
-    lua_rawgeti(L, LUA_REGISTRYINDEX, functionRef);
+        new(newUserdata(sizeof(ScriptablePtr))) ScriptablePtr(object);
+        setMetatable(std::string(object->getScriptableName()) + "_mt");
+    } else
+        pushNil();
 }
 
-int LuaScript::popFunction()
+void LuaScript::pushValue(int index)
 {
-    return ref();
+    lua_pushvalue(L, index);
 }
 
-void LuaScript::releaseFunction(int functionRef)
+void LuaScript::pushRef(int ref)
 {
-    unref(functionRef);
+    lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
 }
 
 void LuaScript::callFunction(int numArgs)
@@ -277,53 +402,33 @@ void LuaScript::callFunction(int numArgs)
         reportError("stack size changed!");
 }
 
-SimpleCallback LuaScript::createSimpleFuncCallback(int funcRef)
+void LuaScript::callModuleField(const std::string& module, const std::string& field)
 {
-    return [this, funcRef]() {
-        pushFunction(funcRef);
-        callFunction();
-    };
-}
-
-boost::function<void(ScriptablePtr)> LuaScript::createScriptableSelfFuncCallback(int funcRef)
-{
-    return [this, funcRef](ScriptablePtr scriptable) {
-        pushClassInstance(scriptable);
-        setGlobal("self");
-
-        pushFunction(funcRef);
-        callFunction();
-
-        pushNil();
-        setGlobal("self");
-    };
-}
-
-void LuaScript::setGlobal(const char *varName)
-{
-    lua_setfield(L, LUA_GLOBALSINDEX, varName);
+    g_lua.rawGetGlobalTableField(module, field);
+    g_lua.callFunction();
 }
 
 void LuaScript::setupPackageLoader()
 {
-    lua_getfield(L, LUA_GLOBALSINDEX, "package");
-    lua_getfield(L, -1, "loaders");
-    lua_remove(L, -2);
-    lua_pushnil(L);
+    lua_getfield(L, LUA_GLOBALSINDEX, "package"); // package
+    lua_getfield(L, -1, "loaders"); // package.loaders, package
+    lua_remove(L, -2); // package.loaders
+    lua_pushnil(L); // nil, package.loaders
     int numLoaders = 0;
     while(lua_next(L, -2) != 0) {
-        lua_pop(L, 1);
+        // value, key, package.loaders
+        lua_pop(L, 1); // key, package.loaders
         numLoaders++;
     }
-    lua_pushinteger(L, numLoaders + 1);
-    lua_pushcfunction(L, &LuaScript::luaPackageLoader);
-    lua_rawset(L, -3);
-    lua_pop(L, 1);
+    lua_pushinteger(L, numLoaders + 1); // at, package.loaders
+    lua_pushcfunction(L, &LuaScript::luaPackageLoader); // luaPackageLoader, at, package.loaders
+    lua_rawset(L, -3); // package.loaders
+    lua_pop(L, 1); // (empty)
 }
 
 void LuaScript::registerClass(const std::string& klass, const std::string& baseClass)
 {
-    // klass_mt = {}
+    // mt = {}
     lua_newtable(L);
     lua_pushvalue(L, -1);
     lua_setfield(L, LUA_REGISTRYINDEX, (klass + "_mt").c_str());
@@ -344,35 +449,60 @@ void LuaScript::registerClass(const std::string& klass, const std::string& baseC
     lua_pushcfunction(L, &LuaScript::luaGarbageCollectMetaMethod);
     lua_setfield(L, -2, "__gc");
 
-    // klass_mt.methods = { }
+    // klass = { }
     lua_newtable(L);
     lua_pushvalue(L, -1);
     lua_setfield(L, LUA_GLOBALSINDEX, klass.c_str());
+
+    // mt.methods = klass
     lua_setfield(L, -2, "methods");
 
-    // klass_mt.fieldmethods = { }
+    // klass_fieldmethods = { }
     lua_newtable(L);
     lua_pushvalue(L, -1);
     lua_setfield(L, LUA_GLOBALSINDEX, (klass + "_fieldmethods").c_str());
+
+    // mt.fieldmethods = klass_fieldmethods
     lua_setfield(L, -2, "fieldmethods");
 
     if(baseClass.length()) {
-        // klass_mt.base = baseClass_mt
-        lua_getfield(L, LUA_REGISTRYINDEX, (baseClass + "_mt").c_str());
-        lua_setfield(L, -2, "base");
+        // get klass
+        lua_getfield(L, LUA_GLOBALSINDEX, klass.c_str());
+
+        // redirect = { __index = baseClass }
+        lua_newtable(L);
+        lua_getfield(L, LUA_GLOBALSINDEX, baseClass.c_str());
+        lua_setfield(L, -2, "__index");
+
+        // setmetatable(klass, redirect)
+        lua_setmetatable(L, -2);
+        lua_pop(L, 1);
+
+        // get klass_fieldmethods
+        lua_getfield(L, LUA_GLOBALSINDEX, (klass + "_fieldmethods").c_str());
+
+        // redirect = { __index = baseClass_fieldmethods }
+        lua_newtable(L);
+        lua_getfield(L, LUA_GLOBALSINDEX, (baseClass + "_fieldmethods").c_str());
+        lua_setfield(L, -2, "__index");
+
+        // setmetatable(klass_fieldmethods, redirect)
+        lua_setmetatable(L, -2);
     }
 
     lua_pop(L, 1);
+
+    m_currentClass = klass;
 }
 
-void LuaScript::registerMemberField(const std::string& klass, const std::string& field, LuaScript::LuaCFunction getFunction, LuaScript::LuaCFunction setFunction)
+void LuaScript::registerMemberField(const std::string& field, LuaScript::LuaCFunction getFunction, LuaScript::LuaCFunction setFunction)
 {
     if(getFunction) {
         int functionId = m_functions.size();
         m_functions.push_back(getFunction);
 
         // push the class table
-        lua_getfield(L, LUA_GLOBALSINDEX, (klass + "_fieldmethods").c_str());
+        lua_getfield(L, LUA_GLOBALSINDEX, (m_currentClass + "_fieldmethods").c_str());
         // push the function id
         lua_pushnumber(L, functionId);
         // store id in the closure
@@ -388,7 +518,7 @@ void LuaScript::registerMemberField(const std::string& klass, const std::string&
         m_functions.push_back(setFunction);
 
         // push the class table
-        lua_getfield(L, LUA_GLOBALSINDEX, (klass + "_fieldmethods").c_str());
+        lua_getfield(L, LUA_GLOBALSINDEX, (m_currentClass + "_fieldmethods").c_str());
         // push the function id
         lua_pushnumber(L, functionId);
         // store id in the closure
@@ -400,13 +530,13 @@ void LuaScript::registerMemberField(const std::string& klass, const std::string&
     }
 }
 
-void LuaScript::registerMemberFunction(const std::string& klass, const std::string& functionName, LuaCFunction function)
+void LuaScript::registerMemberFunction(const std::string& functionName, LuaCFunction function)
 {
     int functionId = m_functions.size();
     m_functions.push_back(function);
 
     // push the class table
-    lua_getfield(L, LUA_GLOBALSINDEX, klass.c_str());
+    lua_getfield(L, LUA_GLOBALSINDEX, m_currentClass.c_str());
     // push the function id
     lua_pushnumber(L, functionId);
     // store id in the closure
@@ -432,9 +562,11 @@ void LuaScript::registerGlobalFunction(const std::string& functionName, LuaCFunc
 
 void LuaScript::registerModule(const std::string& module)
 {
-    // module = {}
-    lua_newtable(L); // module table
-    lua_setfield(L, LUA_GLOBALSINDEX, module.c_str()); // register at globals index
+    registerClass(module);
+    lua_getfield(L, LUA_GLOBALSINDEX, module.c_str());
+    lua_getfield(L, LUA_REGISTRYINDEX, (module + "_mt").c_str());
+    lua_setmetatable(L, -2);
+    lua_pop(L, -1);
 }
 
 int LuaScript::luaPackageLoader(lua_State* L)
@@ -452,50 +584,52 @@ int LuaScript::luaPackageLoader(lua_State* L)
 
 int LuaScript::luaIndexMetaMethod(lua_State* L)
 {
+    // stack: key, obj
     std::string key = lua_tostring(L, -1); // key, obj
     lua_pop(L, 1); // obj
     lua_getmetatable(L, -1); // mt, obj
-    while(!lua_isnil(L, -1)) {
-        lua_getfield(L, -1, "fieldmethods"); // mt.fieldmethods, mt, obj
-        lua_getfield(L, -1, ("get_" + key).c_str()); // mt.fieldmethods[get_key], mt.fieldmethods, mt, obj
-        lua_remove(L, -2); // mt.fieldmethods[get_key], mt, obj
+    lua_getfield(L, -1, "fieldmethods"); // fieldmethods, mt, obj
+    lua_getfield(L, -1, ("get_" + key).c_str()); // get_method, fieldmethods, mt, obj
+    lua_remove(L, -2); // get_method, mt, obj
+    if(!lua_isnil(L, -1)) {
+        lua_remove(L, -2); // get_method, obj
+        lua_insert(L, -2); // obj, get_method
+        lua_pushcfunction(L, &LuaScript::luaErrorHandler); // errorfunc, obj,get_method
+        lua_insert(L, -3); // obj, get_method, errorfunc
+        int ret = lua_pcall(L, 1, 1, -3); // ret, errorfunc
+        if(ret != 0) {
+            g_lua.reportError(g_lua.popString()); // errofunc
+            lua_pop(L, 1); // (empty)
+            lua_pushnil(L); // nil
+        } else {
+            lua_remove(L, -2); // ret
+        }
+        return 1;
+    } else {
+        lua_pop(L, 1); // mt, obj
+        lua_getfield(L, -1, "methods"); // methods, mt, obj
+        lua_getfield(L, -1, key.c_str()); // method, methods, mt, obj
+        lua_remove(L, -2); // method, mt, obj
         if(!lua_isnil(L, -1)) {
-            lua_remove(L, -2); // mt.fieldmethods[get_key], obj
-            lua_insert(L, -2); // obj, mt.fieldmethods[get_key]
-            lua_pushcfunction(L, &LuaScript::luaErrorHandler); // errorfunc, obj, mt.fieldmethods[get_key]
-            lua_insert(L, -3); // obj, mt.fieldmethods[get_key], errorfunc
-            int ret = lua_pcall(L, 1, 1, -3); // ret, errorfunc
-            if(ret != 0) {
-                g_lua.reportError(g_lua.popString()); // errofunc
-                lua_pop(L, 1); // (empty)
-                lua_pushnil(L); // nil
-            } else {
-                lua_remove(L, -2); // ret
-            }
+            lua_insert(L, -3); // obj, mt, method
+            lua_pop(L, 2); // method
             return 1;
-        } else {
-            lua_pop(L, 1); // mt, obj
-            lua_getfield(L, -1, "methods"); // mt.methods, mt, obj
-            lua_getfield(L, -1, key.c_str()); // mt.methods[key], mt.methods, mt, obj
-            lua_remove(L, -2); // mt.methods[key], mt, obj
-            if(!lua_isnil(L, -1)) {
-                lua_insert(L, -3);
-                lua_pop(L, 2);
-                return 1;
-            }
-            lua_pop(L, 1);
         }
-        lua_getfield(L, -1, "base"); // mt.base, mt, obj
-        lua_remove(L, -2); // mt.base, obj
+        lua_pop(L, 1); // mt, obj
     }
-    lua_pop(L, 1);
+    lua_pop(L, 1); // obj
 
-    ScriptablePtr scriptable = g_lua.popClassInstance();
-    int refId = scriptable->getLuaRef(key);
-    if(refId != -1)
-        g_lua.getRef(refId);
-    else
+    // stack: obj
+    if(g_lua.isTable()) {
+        g_lua.rawGet(key);
+        g_lua.remove(-2);
+    } else if(g_lua.isUserdata()) {
+        g_lua.getScriptableField(g_lua.popClassInstance(), key);
+    } else {
+        g_lua.pop();
         g_lua.pushNil();
+        g_lua.reportErrorWithTraceback("unknown type in newindex metamethod");
+    }
 
     return 1;
 }
@@ -503,39 +637,38 @@ int LuaScript::luaIndexMetaMethod(lua_State* L)
 int LuaScript::luaNewIndexMetaMethod(lua_State* L)
 {
     // stack: value, key, obj
-    lua_insert(L, -2);
+    lua_insert(L, -2); // key, value, obj
     std::string key = lua_tostring(L, -1);
-    lua_pop(L, 1);
-    lua_getmetatable(L, -2);
-    // stack: mt, value, obj
-    while(!lua_isnil(L, -1)) {
-        lua_getfield(L, -1, "fieldmethods");
-        lua_getfield(L, -1, ("set_" + key).c_str());
-        lua_remove(L, -2); // stack: set method, mt, value, obj
-        if(!lua_isnil(L, -1)) {
-            lua_remove(L, -2); // mt.fieldmethods[get_key], value, obj
-            lua_insert(L, -3); // value, obj, mt.fieldmethods[get_key]
-            lua_pushcfunction(L, &LuaScript::luaErrorHandler); // errorfunc, value, obj, mt.fieldmethods[get_key]
-            lua_insert(L, -4); // value, obj, mt.fieldmethods[get_key], errorfunc
-            int ret = lua_pcall(L, 2, 0, -4); // errorfunc
-            if(ret != 0)
-                g_lua.reportError(g_lua.popString()); // errofunc
-            lua_pop(L, 1);
-            return 1;
-        }
-        lua_pop(L, 1); // mt, value, obj
-        lua_getfield(L, -1, "base"); // mt.base, mt, value, obj
-        lua_remove(L, -2); // mt.base, value, obj
+    lua_pop(L, 1); //  value, obj
+    lua_getmetatable(L, -2); // mt, value, obj
+    lua_getfield(L, -1, "fieldmethods"); // fieldmethods, mt, value, obj
+    lua_getfield(L, -1, ("set_" + key).c_str()); // set_method, fieldmethods, mt, value, obj
+    lua_remove(L, -2); //  set_method, mt, value, obj
+    if(!lua_isnil(L, -1)) {
+        lua_remove(L, -2); // set_method, value, obj
+        lua_insert(L, -3); // value, obj, set_method
+        lua_pushcfunction(L, &LuaScript::luaErrorHandler); // errorfunc, value, obj, set_method
+        lua_insert(L, -4); // value, obj, set_method, errorfunc
+        int ret = lua_pcall(L, 2, 0, -4); // errorfunc
+        if(ret != 0)
+            g_lua.reportError(g_lua.popString()); // errofunc
+        lua_pop(L, 1); // (empty)
+        return 1;
+    }
+    lua_pop(L, 2); // mt, value, obj
+
+    // stack: value, obj
+    g_lua.insert(-2);
+    if(g_lua.isTable()) {
+        g_lua.insert(-2);
+        g_lua.rawSet(key);
+        g_lua.pop();
+    } else if(g_lua.isUserdata()) {
+        g_lua.setScriptableField(g_lua.popClassInstance(), key);
+    } else {
+        g_lua.pop(2);
+        g_lua.reportErrorWithTraceback("unknown type in index metamethod");
     }
-
-    // stack:
-    g_lua.pop(); // value, obj
-    g_lua.insert(-2); // obj, value
-    ScriptablePtr scriptable = g_lua.popClassInstance();
-    g_lua.pushValue(); // value, value
-    int refId = g_lua.ref();
-    scriptable->associateLuaRef(key, refId);
-    g_lua.pop();
 
     return 1;
 }
@@ -559,8 +692,10 @@ int LuaScript::luaEqualMetaMethod(lua_State* L)
 
 int LuaScript::luaGarbageCollectMetaMethod(lua_State* L)
 {
-    ScriptablePtr *objectRef = (ScriptablePtr *)lua_touserdata(L, -1);
-    objectRef->reset();
+    if(lua_isuserdata(L, -1)) {
+        ScriptablePtr *objectRef = (ScriptablePtr *)lua_touserdata(L, -1);
+        objectRef->reset();
+    }
     lua_pop(L, 1);
     return 1;
 }
diff --git a/src/framework/script/luascript.h b/src/framework/script/luascript.h
index 8aa32d17..0c379c13 100644
--- a/src/framework/script/luascript.h
+++ b/src/framework/script/luascript.h
@@ -27,11 +27,12 @@
 
 #include <prerequisites.h>
 #include <script/scriptable.h>
-#include <lua.hpp>
 
 #define reportFuncError(a) reportError(a, __FUNCTION__)
 #define reportFuncErrorWithTraceback(a) reportErrorWithTraceback(a, __FUNCTION__)
 
+struct lua_State;
+
 class LuaScript
 {
 public:
@@ -41,49 +42,73 @@ public:
     void loadAllModules();
     bool loadFile(const std::string& fileName);
     bool loadBuffer(const std::string& text, const std::string& what = "luaBuffer");
-    int loadBufferAsFunction(const std::string& text, const std::string& what = "luaBuffer");
+    bool loadBufferAsFunction(const std::string& text, const std::string& what = "luaBuffer");
     void reportError(const std::string& errorDesc, const char *funcName = NULL);
     void reportErrorWithTraceback(const std::string& errorDesc, const char *funcName = NULL);
 
     void collectGarbage();
+
     int getStackSize();
     void insert(int index);
+    void remove(int index);
+    void releaseRef(int ref);
+
+    void newTable();
+    void setTable(int index = -3);
+
+    void *newUserdata(int size);
+
+    void newMetatable(const std::string& name);
+    void setMetatable(const std::string& name, int index = -1);
+
+    void rawGet(const std::string& key);
+    void rawSet(const std::string& key);
+    void getField(const std::string& key);
+    void setField(const std::string& key);
 
-    int ref();
-    void unref(int ref);
-    void getRef(int ref);
+    void getScriptableField(const ScriptablePtr& scriptable, const std::string& field);
+    void setScriptableField(const ScriptablePtr& scriptable, const std::string& field);
+
+    void rawGetGlobalTableField(const std::string& globalTable, const std::string& key);
+    void rawSetGlobalTableField(const std::string& globalTable, const std::string& key);
+
+    void getGlobal(const std::string& key);
+    void setGlobal(const std::string& key);
+
+    bool isNil(int index = -1);
+    bool isBoolean(int index = -1);
+    bool isNumber(int index = -1);
+    bool isString(int index = -1);
+    bool isTable(int index = -1);
+    bool isUserdata(int index = -1);
+    bool isFunction(int index = -1);
+    bool isCFunction(int index = -1);
+    bool isLuaFunction(int index = -1);
+
+    void pop(int n = 1);
+    bool popBoolean();
+    int popInteger();
+    std::string popString();
+    ScriptablePtr popClassInstance();
+    int popRef();
 
     void pushNil();
     void pushBoolean(bool b);
     void pushInteger(int i);
     void pushString(const std::string& str);
-    void pushUserdata(void* ptr);
+    void pushClassInstance(const ScriptablePtr& object);
     void pushValue(int index = -1);
+    void pushRef(int ref);
 
-    void pop(int n = 1);
-    bool popBoolean();
-    int32_t popInteger();
-    std::string popString();
-
-    void pushFunction(int functionRef);
-    int popFunction();
-    void releaseFunction(int functionRef);
     void callFunction(int numArgs = 0);
-
-    SimpleCallback createSimpleFuncCallback(int funcRef);
-    boost::function<void(ScriptablePtr)> createScriptableSelfFuncCallback(int funcRef);
-
-    void setGlobal(const char *varName);
-
-    void pushClassInstance(const ScriptablePtr& object);
-    ScriptablePtr popClassInstance();
+    void callModuleField(const std::string& module, const std::string& field);
 
     typedef int (*LuaCFunction)();
 
     void setupPackageLoader();
     void registerClass(const std::string& klass, const std::string& baseClass = "");
-    void registerMemberField(const std::string& klass, const std::string& field, LuaCFunction getFunction, LuaCFunction setFunction = NULL);
-    void registerMemberFunction(const std::string& klass, const std::string& functionName, LuaCFunction function);
+    void registerMemberField(const std::string& field, LuaCFunction getFunction, LuaCFunction setFunction = NULL);
+    void registerMemberFunction(const std::string& functionName, LuaCFunction function);
     void registerGlobalFunction(const std::string& functionName, LuaCFunction function);
     void registerModule(const std::string& module);
 
@@ -99,6 +124,7 @@ public:
 
 private:
     std::vector<LuaCFunction> m_functions;
+    std::string m_currentClass;
     lua_State *L;
 };
 
diff --git a/src/framework/script/scriptable.cpp b/src/framework/script/scriptable.cpp
index e7bf6f4b..277d7e22 100644
--- a/src/framework/script/scriptable.cpp
+++ b/src/framework/script/scriptable.cpp
@@ -27,25 +27,34 @@
 #include <script/luascript.h>
 #include <core/dispatcher.h>
 
-void Scriptable::associateLuaRef(const std::string& refName, int refId)
+int Scriptable::getLuaTableRef()
 {
-    // check if there is already a ref with this name
-    if(m_luaRefs.find(refName) != m_luaRefs.end())
-        g_lua.unref(m_luaRefs[refName]);
-    m_luaRefs[refName] = refId;
+    if(m_luaTableRef == -1) {
+        g_lua.newTable();
+        m_luaTableRef = g_lua.popRef();
+    }
+    return m_luaTableRef;
 }
 
-int Scriptable::getLuaRef(const std::string& refName)
+void Scriptable::releaseLuaTableRef()
 {
-    if(m_luaRefs.find(refName) != m_luaRefs.end())
-        return m_luaRefs[refName];
-    return -1;
+    if(m_luaTableRef != -1) {
+        g_lua.releaseRef(m_luaTableRef);
+        m_luaTableRef = -1;
+    }
 }
 
-void Scriptable::clearLuaRefs()
+void Scriptable::callLuaTableField(const std::string& field)
 {
-    foreach(auto pair, m_luaRefs) {
-        g_lua.unref(pair.second);
-    }
-    m_luaRefs.clear();
+    g_lua.pushClassInstance(shared_from_this());
+    g_lua.setGlobal("self");
+
+    g_lua.getScriptableField(shared_from_this(), field);
+    if(g_lua.isFunction())
+        g_lua.callFunction();
+    else
+        g_lua.pop();
+
+    g_lua.pushNil();
+    g_lua.setGlobal("self");
 }
diff --git a/src/framework/script/scriptable.h b/src/framework/script/scriptable.h
index 2b126313..fd1eada5 100644
--- a/src/framework/script/scriptable.h
+++ b/src/framework/script/scriptable.h
@@ -30,14 +30,16 @@
 class Scriptable : public boost::enable_shared_from_this<Scriptable>
 {
 public:
+    Scriptable() : m_luaTableRef(-1) { }
+
     virtual const char *getScriptableName() const { return NULL; }
 
-    void associateLuaRef(const std::string& refName, int refId);
-    int getLuaRef(const std::string& refName);
-    void clearLuaRefs();
+    int getLuaTableRef();
+    void releaseLuaTableRef();
+    void callLuaTableField(const std::string& field);
 
 private:
-    std::map<std::string, int> m_luaRefs;
+    int m_luaTableRef;
 };
 
 typedef boost::shared_ptr<Scriptable> ScriptablePtr;
diff --git a/src/framework/ui/uibutton.cpp b/src/framework/ui/uibutton.cpp
index 4efa6f2c..4b448473 100644
--- a/src/framework/ui/uibutton.cpp
+++ b/src/framework/ui/uibutton.cpp
@@ -33,8 +33,7 @@ void UIButton::onInputEvent(const InputEvent& event)
     } else if(event.type == EV_MOUSE_LUP && m_state == UI::ButtonDown) {
         m_state = UI::ButtonUp;
         if(getRect().contains(event.mousePos)) {
-            if(m_onClickCallback)
-                g_dispatcher.addTask(boost::bind(m_onClickCallback, asUIElement()));
+            g_dispatcher.addTask(boost::bind(&Scriptable::callLuaTableField, shared_from_this(), "onClick"));
         }
     }
 }
diff --git a/src/framework/ui/uibutton.h b/src/framework/ui/uibutton.h
index cc3a19bb..19298191 100644
--- a/src/framework/ui/uibutton.h
+++ b/src/framework/ui/uibutton.h
@@ -42,18 +42,15 @@ public:
     void onInputEvent(const InputEvent& event);
 
     void setText(const std::string& text) { m_text = text; }
-    const std::string& getText() const { return m_text; }
+    std::string getText() const { return m_text; }
 
     UI::EButtonState getState() { return m_state; }
 
-    void setOnClick(const UIElementCallback& callback) { m_onClickCallback = callback; }
-
     virtual const char *getScriptableName() const { return "UIButton"; }
 
 private:
     std::string m_text;
     UI::EButtonState m_state;
-    UIElementCallback m_onClickCallback;
 };
 
 #endif // UIBUTTON_H
diff --git a/src/framework/ui/uicontainer.cpp b/src/framework/ui/uicontainer.cpp
index 78a2fcae..184aa403 100644
--- a/src/framework/ui/uicontainer.cpp
+++ b/src/framework/ui/uicontainer.cpp
@@ -54,13 +54,14 @@ UIContainerPtr& UIContainer::getRoot()
     return rootContainer;
 }
 
-void UIContainer::addChild(UIElementPtr child)
+void UIContainer::addChild(const UIElementPtr& child)
 {
     m_children.push_back(child);
-    child->setParent(asUIContainer());
+    if(child->getParent() != asUIContainer())
+        child->setParent(asUIContainer());
 }
 
-void UIContainer::removeChild(UIElementPtr child)
+void UIContainer::removeChild(const UIElementPtr& child)
 {
     // defocus if needed
     if(m_focusedElement == child)
@@ -72,8 +73,16 @@ void UIContainer::removeChild(UIElementPtr child)
     // remove from children list
     m_children.remove(child);
 
-    // child must have this container as parent
-    child->setParent(UIContainerPtr());
+    if(child->getParent() == asUIContainer())
+        child->setParent(UIContainerPtr());
+}
+
+bool UIContainer::hasChild(const UIElementPtr& child)
+{
+    auto it = std::find(m_children.begin(), m_children.end(), child);
+    if(it != m_children.end())
+        return true;
+    return false;
 }
 
 UIElementPtr UIContainer::getChildById(const std::string& id)
@@ -201,19 +210,15 @@ void UIContainer::focusNextElement()
         setFocusedElement(element);
 }
 
-void UIContainer::setFocusedElement(UIElementPtr focusedElement)
+void UIContainer::setFocusedElement(const UIElementPtr& focusedElement)
 {
     if(focusedElement != m_focusedElement) {
-        if(m_focusedElement) {
-            m_focusedElement->setFocused(false);
+        if(m_focusedElement)
             m_focusedElement->onFocusChange();
-        }
 
         m_focusedElement = focusedElement;
-        if(m_focusedElement) {
-            m_focusedElement->setFocused(true);
+        if(m_focusedElement)
             m_focusedElement->onFocusChange();
-        }
     }
 
     // when containers are focused they go to the top
@@ -222,7 +227,7 @@ void UIContainer::setFocusedElement(UIElementPtr focusedElement)
     }
 }
 
-bool UIContainer::lockElement(UIElementPtr element)
+bool UIContainer::lockElement(const UIElementPtr& element)
 {
     if(std::find(m_children.begin(), m_children.end(), element) != m_children.end()) {
         m_lockedElements.remove(element);
@@ -238,7 +243,7 @@ bool UIContainer::lockElement(UIElementPtr element)
     return false;
 }
 
-bool UIContainer::unlockElement(UIElementPtr element)
+bool UIContainer::unlockElement(const UIElementPtr& element)
 {
     auto it = std::find(m_lockedElements.begin(), m_lockedElements.end(), element);
     if(it != m_lockedElements.end()) {
diff --git a/src/framework/ui/uicontainer.h b/src/framework/ui/uicontainer.h
index 4769d68c..441df42f 100644
--- a/src/framework/ui/uicontainer.h
+++ b/src/framework/ui/uicontainer.h
@@ -40,29 +40,33 @@ public:
     virtual void onInputEvent(const InputEvent& event);
 
     /// Add an element, this must never be called from events loops
-    void addChild(UIElementPtr child);
+    void addChild(const UIElementPtr& child);
     /// Remove an element, this must never be called from events loops
-    void removeChild(UIElementPtr child);
+    void removeChild(const UIElementPtr& child);
+    /// Check if has child
+    bool hasChild(const UIElementPtr& child);
     /// Find an element in this container by id
     UIElementPtr getChildById(const std::string& id);
     /// Find an element by position
     UIElementPtr getChildByPos(const Point& pos);
     /// Find an element in this container and in its children by id
     UIElementPtr recursiveGetChildById(const std::string& id);
+    /// Get children
+    const std::list<UIElementPtr>& getChildren() const { return m_children; }
     /// Pushs a child to the top
     void pushChildToTop(const UIElementPtr& child);
 
     int getChildCount() const { return m_children.size(); }
 
     /// Disable all children except the specified element
-    bool lockElement(UIElementPtr element);
+    bool lockElement(const UIElementPtr& element);
     /// Renable all children
-    bool unlockElement(UIElementPtr element);
+    bool unlockElement(const UIElementPtr& element);
 
     /// Focus next element
     void focusNextElement();
     /// Focus element
-    void setFocusedElement(UIElementPtr focusedElement);
+    void setFocusedElement(const UIElementPtr& focusedElement);
     /// Get focused element
     UIElementPtr getFocusedElement() const { return m_focusedElement; }
 
diff --git a/src/framework/ui/uielement.cpp b/src/framework/ui/uielement.cpp
index 2865c4e0..7a2c01e3 100644
--- a/src/framework/ui/uielement.cpp
+++ b/src/framework/ui/uielement.cpp
@@ -34,8 +34,7 @@ UIElement::UIElement(UI::EElementType type) :
     UILayout(),
     m_type(type),
     m_visible(true),
-    m_enabled(true),
-    m_focused(false)
+    m_enabled(true)
 {
 
 }
@@ -56,8 +55,7 @@ void UIElement::internalOnDestroy()
     //logTraceDebug(getId());
 
     UIElementPtr me = asUIElement();
-    if(m_onDestroyCallback)
-        m_onDestroyCallback(me);
+    callLuaTableField("onDestroy");
 
     // remove from parent
     if(getParent()) {
@@ -65,7 +63,7 @@ void UIElement::internalOnDestroy()
     }
 
     // free script stuff
-    clearLuaRefs();
+    releaseLuaTableRef();
 
     g_dispatcher.addTask(boost::bind(&UIElement::internalDestroyCheck, asUIElement()));
 }
@@ -90,8 +88,7 @@ void UIElement::setSkin(const UIElementSkinPtr& skin)
 
 void UIElement::onLoad()
 {
-    if(m_onLoadCallback)
-        g_dispatcher.addTask(boost::bind(m_onLoadCallback, asUIElement()));
+    g_dispatcher.addTask(boost::bind(&Scriptable::callLuaTableField, shared_from_this(), "onLoad"));
 }
 
 void UIElement::render()
@@ -139,3 +136,36 @@ void UIElement::moveTo(Point pos)
     }
     setRect(newRect);
 }
+
+void UIElement::setParent(UIContainerPtr parent)
+{
+    UIElementPtr me = asUIElement();
+    UIContainerPtr oldParent = m_parent.lock();
+    m_parent.reset();
+    if(oldParent && oldParent->hasChild(me)) {
+        oldParent->removeChild(me);
+    }
+    if(parent) {
+        m_parent = UIContainerWeakPtr(parent);
+        if(!parent->hasChild(me))
+            parent->addChild(me);
+    }
+}
+
+bool UIElement::isFocused() const
+{
+    if(UIContainerPtr parent = m_parent.lock())
+        return (parent->getFocusedElement() == shared_from_this());
+    return false;
+}
+
+void UIElement::setFocused(bool focused)
+{
+    if(UIContainerPtr parent = m_parent.lock()) {
+        if(focused) {
+            parent->setFocusedElement(asUIElement());
+        } else if(parent->getFocusedElement() == asUIElement()) {
+            parent->setFocusedElement(UIElementPtr());
+        }
+    }
+}
diff --git a/src/framework/ui/uielement.h b/src/framework/ui/uielement.h
index 6d5aaaf5..2b393324 100644
--- a/src/framework/ui/uielement.h
+++ b/src/framework/ui/uielement.h
@@ -67,9 +67,9 @@ public:
     void moveTo(Point pos);
 
     void setSkin(const UIElementSkinPtr& skin);
-    const UIElementSkinPtr& getSkin() const { return m_skin; }
+    UIElementSkinPtr getSkin() const { return m_skin; }
 
-    void setParent(UIContainerPtr parent) { m_parent = parent; }
+    void setParent(UIContainerPtr parent);
     UIContainerPtr getParent() const { return m_parent.lock(); }
 
     void setId(const std::string& id) { m_id = id; }
@@ -78,8 +78,8 @@ public:
     void setEnabled(bool enabled) { m_enabled = enabled; }
     bool isEnabled() const { return m_enabled; }
 
-    void setFocused(bool focused) { m_focused = focused; }
-    bool isFocused() const { return m_focused; }
+    void setFocused(bool focused);
+    bool isFocused() const;
 
     void setVisible(bool visible) { m_visible = visible; }
     bool isVisible() const { return m_visible; }
@@ -91,9 +91,6 @@ public:
     virtual UIContainerPtr asUIContainer() { return UIContainerPtr(); }
     virtual const char *getScriptableName() const { return "UIElement"; }
 
-    void setOnDestroy(const UIElementCallback& onDestroyCallback) { m_onDestroyCallback = onDestroyCallback; }
-    void setOnLoad(const UIElementCallback& onLoadCallback) { m_onLoadCallback = onLoadCallback; }
-
 private:
     UI::EElementType m_type;
     UIContainerWeakPtr m_parent;
@@ -101,9 +98,6 @@ private:
     std::string m_id;
     bool m_visible;
     bool m_enabled;
-    bool m_focused;
-    UIElementCallback m_onLoadCallback;
-    UIElementCallback m_onDestroyCallback;
 };
 
 #endif // UIELEMENT_H
diff --git a/src/framework/ui/uilabel.h b/src/framework/ui/uilabel.h
index 3666ca99..edbf0cb7 100644
--- a/src/framework/ui/uilabel.h
+++ b/src/framework/ui/uilabel.h
@@ -38,7 +38,7 @@ public:
         m_color(Color::white) { }
 
     void setText(const std::string& text);
-    const std::string& getText() const { return m_text; }
+     std::string getText() const { return m_text; }
 
     void setAlign(int align) { m_align = align; }
     int getAlign() const { return m_align; }
diff --git a/src/framework/ui/uilayout.h b/src/framework/ui/uilayout.h
index 233098ee..d5ebb4c7 100644
--- a/src/framework/ui/uilayout.h
+++ b/src/framework/ui/uilayout.h
@@ -66,7 +66,7 @@ private:
 class UILayout : public Scriptable
 {
 public:
-    UILayout() :
+    UILayout() : Scriptable(),
         m_marginLeft(0),
         m_marginRight(0),
         m_marginTop(0),
@@ -79,7 +79,7 @@ public:
     /// Set the layout rect, always absolute position
     void setRect(const Rect& rect);
     /// Get layout size, it always return the absolute position
-    const Rect& getRect() const{ return m_rect; }
+    Rect getRect() const { return m_rect; }
 
     // anchors add methods
     bool addAnchor(EAnchorType type, const AnchorLine& anchorLine);
diff --git a/src/framework/ui/uiloader.cpp b/src/framework/ui/uiloader.cpp
index 1e6f25a8..086c7465 100644
--- a/src/framework/ui/uiloader.cpp
+++ b/src/framework/ui/uiloader.cpp
@@ -215,23 +215,17 @@ void UILoader::loadElement(const UIElementPtr& element, const YAML::Node& node)
     // load events
     if(node.FindValue("onLoad")) {
         const YAML::Node& cnode = node["onLoad"];
-        int funcRef = g_lua.loadBufferAsFunction(cnode.Read<std::string>(), element->getId() + ":onLoad");
-        if(funcRef != LUA_REFNIL) {
-            g_lua.pushClassInstance(element);
-            g_lua.pushFunction(funcRef);
-            lua_UIElement_setOnLoad();
-        } else
+        if(g_lua.loadBufferAsFunction(cnode.Read<std::string>(), element->getId() + ":onLoad"))
+            g_lua.setScriptableField(element, "onLoad");
+        else
             logError(YAML::Exception(cnode.GetMark(), "failed to parse inline lua script").what());
     }
 
     if(node.FindValue("onDestroy")) {
         const YAML::Node& cnode = node["onDestroy"];
-        int funcRef = g_lua.loadBufferAsFunction(cnode.Read<std::string>(), element->getId() + ":onDestroy");
-        if(funcRef != LUA_REFNIL) {
-            g_lua.pushClassInstance(element);
-            g_lua.pushFunction(funcRef);
-            lua_UIElement_setOnDestroy();
-        } else
+        if(g_lua.loadBufferAsFunction(cnode.Read<std::string>(), element->getId() + ":onDestroy"))
+            g_lua.setScriptableField(element, "onDestroy");
+        else
             logError(YAML::Exception(cnode.GetMark(), "failed to parse inline lua script").what());
     }
 
@@ -314,13 +308,9 @@ void UILoader::loadButton(const UIButtonPtr& button, const YAML::Node& node)
 
     // set on click event
     if(node.FindValue("onClick")) {
-        int funcRef = g_lua.loadBufferAsFunction(node["onClick"].Read<std::string>(), button->getId() + ":onClick");
-        if(funcRef != LUA_REFNIL) {
-            g_lua.pushClassInstance(button);
-            g_lua.pushFunction(funcRef);
-            lua_UIButton_setOnClick();
-        } else {
+        if(g_lua.loadBufferAsFunction(node["onClick"].Read<std::string>(), button->getId() + ":onClick"))
+            g_lua.setScriptableField(button, "onClick");
+        else
             logError(YAML::Exception(node["onClick"].GetMark(), "failed to parse inline lua script").what());
-        }
     }
 }
diff --git a/src/framework/ui/uitextedit.h b/src/framework/ui/uitextedit.h
index 3fb8261e..8bd6e2ef 100644
--- a/src/framework/ui/uitextedit.h
+++ b/src/framework/ui/uitextedit.h
@@ -41,7 +41,7 @@ public:
     void onFocusChange();
 
     void setText(const std::string& text);
-    const std::string& getText() const { return m_textArea.getText(); }
+    std::string getText() const { return m_textArea.getText(); }
     TextArea& getTextArea() { return m_textArea; }
 
     bool isFocusable() const { return true; }
diff --git a/src/framework/ui/uiwindow.h b/src/framework/ui/uiwindow.h
index 85165eca..c6d1e448 100644
--- a/src/framework/ui/uiwindow.h
+++ b/src/framework/ui/uiwindow.h
@@ -38,7 +38,7 @@ public:
     void onInputEvent(const InputEvent& event);
 
     void setTitle(const std::string& title) { m_title = title; }
-    const std::string& getTitle() const { return m_title; }
+    std::string getTitle() const { return m_title; }
 
     virtual const char *getScriptableName() const { return "UIWindow"; }