diff --git a/modules/core_lib/core_lib.otmod b/modules/core_lib/core_lib.otmod
index 0845338d..c0d7cc20 100644
--- a/modules/core_lib/core_lib.otmod
+++ b/modules/core_lib/core_lib.otmod
@@ -8,14 +8,8 @@ Module
   reloadable: false
 
   @onLoad: |
-    dofile 'ext/table'
-    dofile 'ext/string'
-    dofile 'ext/os'
-
-    dofile 'math/point'
-    dofile 'math/size'
-    dofile 'math/color'
-    dofile 'math/rect'
+    dofiles 'ext'
+    dofiles 'math'
 
     dofile 'const'
     dofile 'util'
@@ -25,23 +19,6 @@ Module
     dofile 'mouse'
     dofile 'string'
 
-    dofile 'ui/effects'
-    dofile 'ui/radiogroup'
-    dofile 'ui/tooltip'
-
-    dofile 'widgets/uiwidget'
-    dofile 'widgets/uibutton'
-    dofile 'widgets/uilabel'
-    dofile 'widgets/uicheckbox'
-    dofile 'widgets/uicombobox'
-    dofile 'widgets/uispinbox'
-    dofile 'widgets/uiprogressbar'
-    dofile 'widgets/uitabbar'
-    dofile 'widgets/uipopupmenu'
-    dofile 'widgets/uiwindow'
-    dofile 'widgets/uimessagebox'
-    dofile 'widgets/uisplitter'
-    dofile 'widgets/uiscrollbar'
-    dofile 'widgets/uiscrollarea'
-    dofile 'widgets/uiresizeborder'
+    dofiles 'ui'
+    dofiles 'widgets'
 
diff --git a/modules/core_lib/widgets/uimessagebox.lua b/modules/core_lib/widgets/uimessagebox.lua
index b9f232aa..2b59f0d3 100644
--- a/modules/core_lib/widgets/uimessagebox.lua
+++ b/modules/core_lib/widgets/uimessagebox.lua
@@ -1,3 +1,5 @@
+if not UIWindow then dofile 'uiwindow' end
+
 UIMessageBox = extends(UIWindow)
 
 MessageBoxOk = 1
diff --git a/src/framework/luascript/luainterface.cpp b/src/framework/luascript/luainterface.cpp
index 384132c3..d0c69bc2 100644
--- a/src/framework/luascript/luainterface.cpp
+++ b/src/framework/luascript/luainterface.cpp
@@ -536,6 +536,24 @@ int LuaInterface::luaScriptRunner(lua_State* L)
     }
 }
 
+int LuaInterface::luaScriptsRunner(lua_State* L)
+{
+    std::string directory = g_lua.popString();
+
+    for(const std::string& fileName : g_resources.listDirectoryFiles(directory)) {
+        if(!boost::ends_with(fileName, ".lua"))
+            continue;
+
+        try {
+            g_lua.loadScript(directory + "/" + fileName);
+            g_lua.call(0, 0);
+        } catch(LuaException& e) {
+            logError("failed to load script file '", fileName, "' :'", e.what());
+        }
+    }
+    return 0;
+}
+
 int LuaInterface::luaErrorHandler(lua_State* L)
 {
     // pops the error message
@@ -614,6 +632,10 @@ void LuaInterface::createLuaState()
     // replace dofile
     pushCFunction(&LuaInterface::luaScriptRunner);
     setGlobal("dofile");
+
+    // dofiles
+    pushCFunction(&LuaInterface::luaScriptsRunner);
+    setGlobal("dofiles");
 }
 
 void LuaInterface::closeLuaState()
diff --git a/src/framework/luascript/luainterface.h b/src/framework/luascript/luainterface.h
index 9e900b72..e731ed65 100644
--- a/src/framework/luascript/luainterface.h
+++ b/src/framework/luascript/luainterface.h
@@ -188,6 +188,8 @@ private:
     static int luaScriptLoader(lua_State* L);
     /// Run scripts requested by lua 'dofile'
     static int luaScriptRunner(lua_State* L);
+    /// Run scripts requested by lua 'dofiles'
+    static int luaScriptsRunner(lua_State* L);
     /// Handle lua errors from safeCall
     static int luaErrorHandler(lua_State* L);
     /// Handle bound cpp functions callbacks
diff --git a/src/framework/ui/uiwidget.cpp b/src/framework/ui/uiwidget.cpp
index d53ba62c..effdb586 100644
--- a/src/framework/ui/uiwidget.cpp
+++ b/src/framework/ui/uiwidget.cpp
@@ -461,6 +461,20 @@ void UIWidget::applyStyle(const OTMLNodePtr& styleNode)
 
     m_loadingStyle = true;
     try {
+        // translate ! style tags
+        for(const OTMLNodePtr& node : styleNode->children()) {
+            if(node->tag()[0] == '!') {
+                std::string tag = node->tag().substr(1);
+                std::string code = Fw::formatString("tostring(%s)", node->value().c_str());
+                std::string origin = "@" + node->source() + "[" + node->tag() + "]";
+                g_lua.evaluateExpression(code, origin);
+                std::string value = g_lua.popString();
+
+                node->setTag(tag);
+                node->setValue(value);
+            }
+        }
+
         onStyleApply(styleNode->tag(), styleNode);
         callLuaField("onStyleApply", styleNode->tag(), styleNode);
 
@@ -471,7 +485,6 @@ void UIWidget::applyStyle(const OTMLNodePtr& styleNode)
                 focus();
         }
         m_firstOnStyle = false;
-
     } catch(Exception& e) {
         logError("Failed to apply style to widget '", m_id, "' style: ", e.what());
     }