diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8d016879..f95f5f23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,8 +73,10 @@ SET(SOURCES
     src/framework/util.cpp
 
 # ui
+    src/framework/ui/anchorlayout.cpp
     src/framework/ui/uielement.cpp
     src/framework/ui/uielementskin.cpp
+    src/framework/ui/uibuttonskin.cpp
     src/framework/ui/uicontainer.cpp
     src/framework/ui/uiskins.cpp
     src/framework/ui/uipanel.cpp
diff --git a/src/framework/engine.cpp b/src/framework/engine.cpp
index 0e82e9ed..c89229a1 100644
--- a/src/framework/engine.cpp
+++ b/src/framework/engine.cpp
@@ -140,7 +140,7 @@ void Engine::onResize(const Size& size)
         m_currentState->onResize(size);
 }
 
-void Engine::onInputEvent(InputEvent *event)
+void Engine::onInputEvent(const InputEvent& event)
 {
     // inputs goest to gui first
     if(!g_ui->onInputEvent(event)) {
diff --git a/src/framework/engine.h b/src/framework/engine.h
index 29025430..5a85634f 100644
--- a/src/framework/engine.h
+++ b/src/framework/engine.h
@@ -60,7 +60,7 @@ public:
     /// Fired by platform on window resize
     void onResize(const Size& size);
     /// Fired by platform on mouse/keyboard input
-    void onInputEvent(InputEvent *event);
+    void onInputEvent(const InputEvent& event);
 
     /// Enable FPS counter on screen
     void enableFpsCounter(bool enable = true) { m_calculateFps = enable; };
diff --git a/src/framework/gamestate.h b/src/framework/gamestate.h
index 2b007688..37fdd939 100644
--- a/src/framework/gamestate.h
+++ b/src/framework/gamestate.h
@@ -25,6 +25,7 @@
 #ifndef GAMESTATE_H
 #define GAMESTATE_H
 
+#include "input.h"
 #include "size.h"
 
 struct InputEvent;
@@ -39,7 +40,7 @@ public:
     virtual void onLeave() = 0;
 
     virtual void onClose() = 0;
-    virtual void onInputEvent(InputEvent *event) = 0;
+    virtual void onInputEvent(const InputEvent& event) = 0;
     virtual void onResize(const Size& size) = 0;
 
     virtual void render() = 0;
diff --git a/src/framework/input.h b/src/framework/input.h
index 0090852d..4f74b765 100644
--- a/src/framework/input.h
+++ b/src/framework/input.h
@@ -25,6 +25,8 @@
 #ifndef INPUT_H
 #define INPUT_H
 
+#include "prerequisites.h"
+
 enum EKeyCode {
     KC_UNKNOWN     = 0x00,
     KC_ESCAPE      = 0x01,
diff --git a/src/framework/ui/uibutton.cpp b/src/framework/ui/uibutton.cpp
index b246ea28..bea92336 100644
--- a/src/framework/ui/uibutton.cpp
+++ b/src/framework/ui/uibutton.cpp
@@ -30,5 +30,17 @@ void UIButton::render()
 {
     UIElement::render();
 
-    g_fonts.get("tibia-8px-antialised")->renderText(m_text, m_rect, ALIGN_CENTER);
+    g_fonts.get("tibia-8px-antialised")->renderText(m_text, getRect(), ALIGN_CENTER);
+}
+
+bool UIButton::onInputEvent(const InputEvent& event)
+{
+    if(event.type == EV_MOUSE_LDOWN &&
+        getRect().contains(Point(event.mouse.x, event.mouse.y))) {
+        m_state = UI::ButtonDown;
+    } else if(m_state == UI::ButtonDown &&
+              event.type == EV_MOUSE_LUP) {
+        m_state = UI::ButtonUp;
+    }
+    return false;
 }
diff --git a/src/framework/ui/uibutton.h b/src/framework/ui/uibutton.h
index 61e27222..acff35a4 100644
--- a/src/framework/ui/uibutton.h
+++ b/src/framework/ui/uibutton.h
@@ -39,6 +39,9 @@ public:
         }
 
     virtual void render();
+    bool onInputEvent(const InputEvent& event);
+
+    UI::EButtonState getState() { return m_state; }
 
 private:
     std::string m_text;
diff --git a/src/framework/ui/uiconstants.h b/src/framework/ui/uiconstants.h
index 4239240f..16774979 100644
--- a/src/framework/ui/uiconstants.h
+++ b/src/framework/ui/uiconstants.h
@@ -53,7 +53,7 @@ namespace UI {
 
     enum EElementType
     {
-        Element,
+        Element = 0,
         Container,
         Panel,
         Window,
diff --git a/src/framework/ui/uicontainer.cpp b/src/framework/ui/uicontainer.cpp
index 51e085a2..19821415 100644
--- a/src/framework/ui/uicontainer.cpp
+++ b/src/framework/ui/uicontainer.cpp
@@ -57,13 +57,20 @@ void UIContainer::render()
     UIElement::render();
     for(auto it = m_children.begin(); it != m_children.end(); ++it) {
         const UIElementPtr& child = (*it);
-        child->render();
+        if(child->isVisible())
+            child->render();
     }
 }
 
-bool UIContainer::onInputEvent(InputEvent* event)
+bool UIContainer::onInputEvent(const InputEvent& event)
 {
-    return false;
+    bool ret = false;
+    for(auto it = m_children.begin(); it != m_children.end(); ++it) {
+        const UIElementPtr& child = (*it);
+        if(child->isEnabled() && child->isVisible())
+            ret = child->onInputEvent(event) || ret;
+    }
+    return ret;
 }
 
 void UIContainer::setActiveElement(UIElementPtr activeElement)
diff --git a/src/framework/ui/uicontainer.h b/src/framework/ui/uicontainer.h
index 59af838c..0ef14f6f 100644
--- a/src/framework/ui/uicontainer.h
+++ b/src/framework/ui/uicontainer.h
@@ -41,7 +41,7 @@ public:
     UIElementPtr getChildById(const std::string& id) const;
 
     virtual void render();
-    virtual bool onInputEvent(InputEvent *event);
+    virtual bool onInputEvent(const InputEvent& event);
 
     void setActiveElement(UIElementPtr activeElement);
     UIElementPtr getActiveElement() const { return m_activeElement; }
diff --git a/src/framework/ui/uielement.cpp b/src/framework/ui/uielement.cpp
index 59aa1e2a..afb01d57 100644
--- a/src/framework/ui/uielement.cpp
+++ b/src/framework/ui/uielement.cpp
@@ -26,40 +26,15 @@
 #include "uiskins.h"
 #include "uielementskin.h"
 
-int AnchorLine::getPos() const
-{
-    UIElementPtr element = m_relativeElement.lock();
-    if(element) {
-        switch(m_anchorType) {
-            case ANCHOR_LEFT:
-                return element->getRect().left();
-            case ANCHOR_RIGHT:
-                return element->getRect().right();
-            case ANCHOR_TOP:
-                return element->getRect().top();
-            case ANCHOR_BOTTOM:
-                return element->getRect().bottom();
-            case ANCHOR_HORIZONTAL_CENTER:
-                return element->getRect().horizontalCenter();
-            case ANCHOR_VERTICAL_CENTER:
-                return element->getRect().verticalCenter();
-            default:
-                return 0;
-        }
-    }
-    logError("anchor line of an element have expired");
-    return 0;
-}
-
 UIElement::UIElement(UI::EElementType type) :
+    AnchorLayout(),
     m_type(type),
-    m_marginLeft(0),
-    m_marginRight(0),
-    m_marginTop(0),
-    m_marginBottom(0)
+    m_visible(true),
+    m_enabled(true)
 {
     // set default skin
-    setSkin(g_uiSkins.getElementSkin(type));
+    if(type > UI::Container)
+        setSkin(g_uiSkins.getElementSkin(type));
 }
 
 
@@ -71,7 +46,7 @@ bool UIElement::setSkin(const std::string& skinName)
 
 void UIElement::setSkin(UIElementSkin* skin)
 {
-    if(skin && !m_rect.isValid()) {
+    if(skin && !getRect().isValid()) {
         setSize(skin->getDefaultSize());
     }
     m_skin = skin;
@@ -82,76 +57,3 @@ void UIElement::render()
     if(m_skin)
         m_skin->draw(this);
 }
-
-void UIElement::setSize(const Size& size)
-{
-    m_rect.setSize(size);
-    recalculateAnchors();
-}
-
-void UIElement::setRect(const Rect& rect)
-{
-    m_rect = rect;
-    recalculateAnchors();
-}
-
-void UIElement::addAnchor(EAnchorType type, const AnchorLine& anchorLine)
-{
-    if(!anchorLine.isValid()) {
-        logError("anchoring for an element has failed, got an invalid anchor line");
-        return;
-    }
-    m_anchors[type] = anchorLine;
-    anchorLine.getRelativeElement()->addAnchoredElement(asUIElement());
-    recalculateAnchors();
-}
-
-void UIElement::addAnchoredElement(UIElementPtr anchoredElement)
-{
-    bool found = false;
-    for(auto it = m_anchoredElements.begin(); it != m_anchoredElements.end(); ++it) {
-        if((*it).lock() == anchoredElement) {
-            found = true;
-            break;
-        }
-    }
-    if(!found)
-        m_anchoredElements.push_back(anchoredElement);
-}
-
-void UIElement::recalculateAnchors()
-{
-    // horizontal
-    if(m_anchors[ANCHOR_HORIZONTAL_CENTER].isValid()) {
-        m_rect.moveHorizontalCenter(m_anchors[ANCHOR_HORIZONTAL_CENTER].getPos() + m_marginLeft - m_marginRight);
-    } else {
-        if(m_anchors[ANCHOR_LEFT].isValid() && m_anchors[ANCHOR_RIGHT].isValid()) {
-            m_rect.setLeft(m_anchors[ANCHOR_LEFT].getPos() + m_marginLeft);
-            m_rect.setRight(m_anchors[ANCHOR_RIGHT].getPos() - m_marginRight);
-        } else if(m_anchors[ANCHOR_LEFT].isValid()) {
-            m_rect.moveLeft(m_anchors[ANCHOR_LEFT].getPos() + m_marginLeft);
-        } else if(m_anchors[ANCHOR_RIGHT].isValid()) {
-            m_rect.moveRight(m_anchors[ANCHOR_RIGHT].getPos() - m_marginRight);
-        }
-    }
-
-    // vertical
-    if(m_anchors[ANCHOR_VERTICAL_CENTER].isValid()) {
-        m_rect.moveVerticalCenter(m_anchors[ANCHOR_VERTICAL_CENTER].getPos() + m_marginTop - m_marginBottom);
-    } else {
-        if(m_anchors[ANCHOR_TOP].isValid() && m_anchors[ANCHOR_BOTTOM].isValid()) {
-            m_rect.setLeft(m_anchors[ANCHOR_TOP].getPos() + m_marginTop);
-            m_rect.setRight(m_anchors[ANCHOR_BOTTOM].getPos() - m_marginBottom);
-        } else if(m_anchors[ANCHOR_TOP].isValid()) {
-            m_rect.moveTop(m_anchors[ANCHOR_TOP].getPos() + m_marginTop);
-        } else if(m_anchors[ANCHOR_BOTTOM].isValid()) {
-            m_rect.moveBottom(m_anchors[ANCHOR_BOTTOM].getPos() - m_marginBottom);
-        }
-    }
-
-    for(auto it = m_anchoredElements.begin(); it != m_anchoredElements.end(); ++it) {
-        UIElementPtr element = (*it).lock();
-        if(element)
-            element->recalculateAnchors();
-    }
-}
diff --git a/src/framework/ui/uielement.h b/src/framework/ui/uielement.h
index 6578c84b..ae3c6014 100644
--- a/src/framework/ui/uielement.h
+++ b/src/framework/ui/uielement.h
@@ -29,6 +29,7 @@
 #include "../input.h"
 #include "../rect.h"
 #include "uiconstants.h"
+#include "anchorlayout.h"
 
 class UIElementSkin;
 
@@ -40,43 +41,14 @@ class UIElement;
 typedef std::shared_ptr<UIElement> UIElementPtr;
 typedef std::weak_ptr<UIElement> UIElementWeakPtr;
 
-enum EAnchorType {
-    ANCHOR_LEFT = 0,
-    ANCHOR_RIGHT,
-    ANCHOR_TOP,
-    ANCHOR_BOTTOM,
-    ANCHOR_HORIZONTAL_CENTER,
-    ANCHOR_VERTICAL_CENTER,
-    ANCHOR_NONE
-};
-
-class AnchorLine
-{
-public:
-    AnchorLine() : m_anchorType(ANCHOR_NONE) { }
-    AnchorLine(const AnchorLine& other) :
-        m_relativeElement(other.m_relativeElement), m_anchorType(other.m_anchorType) { }
-    AnchorLine(UIElementPtr relativeElement, EAnchorType anchorType) :
-        m_relativeElement(relativeElement), m_anchorType(anchorType) { }
-    bool isValid() const { return (m_anchorType != ANCHOR_NONE && !m_relativeElement.expired()); }
-
-    int getPos() const;
-    EAnchorType getAnchorType() const { return m_anchorType; }
-    UIElementPtr getRelativeElement() const { return m_relativeElement.lock(); }
-
-private:
-    UIElementWeakPtr m_relativeElement;
-    EAnchorType m_anchorType;
-};
-
-class UIElement : public std::enable_shared_from_this<UIElement>
+class UIElement : public AnchorLayout
 {
 public:
     UIElement(UI::EElementType type = UI::Element);
     virtual ~UIElement() { }
 
     virtual void render();
-    virtual bool onInputEvent(InputEvent *event) { return false; }
+    virtual bool onInputEvent(const InputEvent& event) { return false; }
 
     bool setSkin(const std::string& skinName);
     void setSkin(UIElementSkin *skin);
@@ -88,62 +60,23 @@ public:
     void setId(const std::string& id) { m_id = id; }
     const std::string& getId() const { return m_id; }
 
-    void setSize(const Size& size);
-    Size getSize() { return m_rect.size(); }
-
-    void setRect(const Rect& rect);
-    const Rect& getRect() const{ return m_rect; }
-
-    void setActive(bool active) { m_active = active; }
-    bool isActive() const { return m_active; }
+    void setEnabled(bool enabled) { m_enabled = enabled; }
+    bool isEnabled() const { return m_enabled; }
 
     void setVisible(bool visible) { m_visible = visible; }
     bool isVisible() const { return m_visible; }
 
     UI::EElementType getElementType() const { return m_type; }
 
-    UIElementPtr asUIElement() { return shared_from_this(); }
-
-    void recalculateAnchors();
-
-    void addAnchor(EAnchorType type, const AnchorLine& anchorLine);
-    void anchorLeft(const AnchorLine& anchorLine) { addAnchor(ANCHOR_LEFT, anchorLine); }
-    void anchorRight(const AnchorLine& anchorLine) { addAnchor(ANCHOR_RIGHT, anchorLine); }
-    void anchorTop(const AnchorLine& anchorLine) { addAnchor(ANCHOR_TOP, anchorLine); }
-    void anchorBottom(const AnchorLine& anchorLine) { addAnchor(ANCHOR_BOTTOM, anchorLine); }
-    void anchorHorizontalCenter(const AnchorLine& anchorLine) { addAnchor(ANCHOR_HORIZONTAL_CENTER, anchorLine); }
-    void anchorVerticalCenter(const AnchorLine& anchorLine) { addAnchor(ANCHOR_VERTICAL_CENTER, anchorLine); }
-
-    AnchorLine left() { return AnchorLine(asUIElement(), ANCHOR_LEFT); }
-    AnchorLine right() { return AnchorLine(asUIElement(), ANCHOR_RIGHT); }
-    AnchorLine top() { return AnchorLine(asUIElement(), ANCHOR_TOP); }
-    AnchorLine bottom() { return AnchorLine(asUIElement(), ANCHOR_BOTTOM); }
-    AnchorLine horizontalCenter() { return AnchorLine(asUIElement(), ANCHOR_HORIZONTAL_CENTER); }
-    AnchorLine verticalCenter() { return AnchorLine(asUIElement(), ANCHOR_VERTICAL_CENTER); }
-
-    void setMargin(int top, int left, int bottom, int right) { m_marginLeft = left; m_marginRight = right; m_marginTop = top; m_marginBottom = bottom; recalculateAnchors(); }
-    void setMargin(int horizontal, int vertical) { m_marginLeft = m_marginRight = horizontal; m_marginTop = m_marginBottom = vertical; recalculateAnchors(); }
-    void setMargin(int margin) { m_marginLeft = m_marginRight = m_marginTop = m_marginBottom = margin; recalculateAnchors(); }
-
-protected:
-    void addAnchoredElement(UIElementPtr anchoredElement);
+    UIElementPtr asUIElement() { return std::static_pointer_cast<UIElement>(shared_from_this()); }
 
+private:
     UI::EElementType m_type;
     UIContainerWeakPtr m_parent;
     UIElementSkin *m_skin;
-    Rect m_rect;
     std::string m_id;
     bool m_visible;
-    bool m_active;
-
-private:
-    AnchorLine m_anchors[6];
-
-    int m_marginLeft;
-    int m_marginRight;
-    int m_marginTop;
-    int m_marginBottom;
-    std::list<UIElementWeakPtr> m_anchoredElements;
+    bool m_enabled;
 };
 
 #endif // UIELEMENT_H
diff --git a/src/framework/ui/uielementskin.cpp b/src/framework/ui/uielementskin.cpp
index 2698f0ef..f1f21024 100644
--- a/src/framework/ui/uielementskin.cpp
+++ b/src/framework/ui/uielementskin.cpp
@@ -30,17 +30,20 @@
 
 void UIElementSkin::draw(UIElement *element)
 {
-    const ImagePtr& image = m_stateImages.front();
-    if(image) {
-        image->draw(element->getRect());
-    }
+    if(m_defaultImage)
+        m_defaultImage->draw(element->getRect());
 }
 
 void UIElementSkin::load(const YAML::Node& node)
 {
     if(node.FindValue("default size"))
         node["default size"] >> m_defaultSize;
+    m_defaultImage = loadImage(node);
+}
 
+ImagePtr UIElementSkin::loadImage(const YAML::Node& node)
+{
+    ImagePtr image;
     if(node.FindValue("bordered image")) {
         const YAML::Node& child = node["bordered image"];
         Rect left, right, top, bottom, topLeft, topRight, bottomLeft, bottomRight, center;
@@ -63,16 +66,17 @@ void UIElementSkin::load(const YAML::Node& node)
             texture = g_uiSkins.getDefaultTexture();
         }
 
-        ImagePtr image = ImagePtr(new BorderedImage(texture,
-                                           left,
-                                           right,
-                                           top,
-                                           bottom,
-                                           topLeft,
-                                           topRight,
-                                           bottomLeft,
-                                           bottomRight,
-                                           center));
-        m_stateImages.push_back(image);
+        image = ImagePtr(new BorderedImage(texture,
+                                                    left,
+                                                    right,
+                                                    top,
+                                                    bottom,
+                                                    topLeft,
+                                                    topRight,
+                                                    bottomLeft,
+                                                    bottomRight,
+                                                    center));
     }
+    return image;
 }
+
diff --git a/src/framework/ui/uielementskin.h b/src/framework/ui/uielementskin.h
index 3d456fc5..05b402e3 100644
--- a/src/framework/ui/uielementskin.h
+++ b/src/framework/ui/uielementskin.h
@@ -39,18 +39,22 @@ public:
         m_name(name),
         m_elementType(elementType) { }
 
-    void load(const YAML::Node& node);
-    void draw(UIElement *element);
+    virtual void load(const YAML::Node& node);
+    virtual void draw(UIElement *element);
 
     const std::string& getName() const { return m_name; }
     const Size& getDefaultSize() const { return m_defaultSize; }
     UI::EElementType getElementType() const { return m_elementType; }
+    ImagePtr getDefaultImage() const { return m_defaultImage; }
+
+protected:
+    ImagePtr loadImage(const YAML::Node& node);
 
 private:
     std::string m_name;
     UI::EElementType m_elementType;
     Size m_defaultSize;
-    std::vector<ImagePtr> m_stateImages;
+    ImagePtr m_defaultImage;
 };
 
 #endif // UIELEMENTSKIN_H
diff --git a/src/framework/ui/uiskins.cpp b/src/framework/ui/uiskins.cpp
index cf9c7e6a..ac6bbfd0 100644
--- a/src/framework/ui/uiskins.cpp
+++ b/src/framework/ui/uiskins.cpp
@@ -26,6 +26,7 @@
 #include "../resources.h"
 #include "../textures.h"
 #include "uielementskin.h"
+#include "uibuttonskin.h"
 
 UISkins g_uiSkins;
 
@@ -61,9 +62,9 @@ bool UISkins::load(const std::string& file)
                 std::string name;
                 it.first() >> name;
 
-                UIElementSkin *elementSkin = new UIElementSkin(name, UI::Button);
-                elementSkin->load(it.second());
-                m_elementSkins.push_back(elementSkin);
+                UIButtonSkin *skin = new UIButtonSkin(name, UI::Button);
+                skin->load(it.second());
+                m_elementSkins.push_back(skin);
             }
         }
 
@@ -73,9 +74,9 @@ bool UISkins::load(const std::string& file)
                 std::string name;
                 it.first() >> name;
 
-                UIElementSkin *elementSkin = new UIElementSkin(name, UI::Panel);
-                elementSkin->load(it.second());
-                m_elementSkins.push_back(elementSkin);
+                UIElementSkin *skin = new UIElementSkin(name, UI::Panel);
+                skin->load(it.second());
+                m_elementSkins.push_back(skin);
             }
         }
     } catch (YAML::ParserException& e) {
diff --git a/src/framework/x11platform.cpp b/src/framework/x11platform.cpp
index ba08f708..a4021596 100644
--- a/src/framework/x11platform.cpp
+++ b/src/framework/x11platform.cpp
@@ -351,7 +351,7 @@ void Platform::poll()
                         inputEvent.type = EV_TEXT_ENTER;
                         inputEvent.key.keychar = buf[0];
                         inputEvent.key.keycode = KC_UNKNOWN;
-                        g_engine.onInputEvent(&inputEvent);
+                        g_engine.onInputEvent(inputEvent);
                     }
                 }
 
@@ -364,7 +364,7 @@ void Platform::poll()
                     inputEvent.key.keycode = x11.keyMap[keysym];
                     inputEvent.type = (event.type == KeyPress) ? EV_KEY_DOWN : EV_KEY_UP;
                     inputEvent.key.keychar = (len > 0) ? buf[0] : 0;
-                    g_engine.onInputEvent(&inputEvent);
+                    g_engine.onInputEvent(inputEvent);
                 }
                 break;
             }
@@ -387,14 +387,14 @@ void Platform::poll()
                         inputEvent.type = EV_MOUSE_WHEEL_DOWN;
                         break;
                 }
-                g_engine.onInputEvent(&inputEvent);
+                g_engine.onInputEvent(inputEvent);
                 break;
 
             case MotionNotify:
                 inputEvent.type = EV_MOUSE_MOVE;
                 inputEvent.mouse.x = event.xbutton.x;
                 inputEvent.mouse.y = event.xbutton.y;
-                g_engine.onInputEvent(&inputEvent);
+                g_engine.onInputEvent(inputEvent);
                 break;
 
             case MapNotify:
diff --git a/src/menustate.cpp b/src/menustate.cpp
index d239523d..c4cf3f74 100644
--- a/src/menustate.cpp
+++ b/src/menustate.cpp
@@ -55,7 +55,7 @@ void MenuState::onClose()
     g_engine.stop();
 }
 
-void MenuState::onInputEvent(InputEvent* event)
+void MenuState::onInputEvent(const InputEvent& event)
 {
 
 }
@@ -93,28 +93,24 @@ void MenuState::createMainMenu()
     m_menuPanel->setMargin(0, 60, 70, 0);
 
     button = UIButtonPtr(new UIButton("Enter Game"));
-    button->anchorLeft(m_menuPanel->left());
     button->anchorTop(m_menuPanel->top());
     button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
     button->setMargin(y += 16);
     m_menuPanel->addChild(button);
 
     button = UIButtonPtr(new UIButton("Access Account"));
-    button->anchorLeft(m_menuPanel->left());
     button->anchorTop(m_menuPanel->top());
     button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
     button->setMargin(y += 30);
     m_menuPanel->addChild(button);
 
     button = UIButtonPtr(new UIButton("Options"));
-    button->anchorLeft(m_menuPanel->left());
     button->anchorTop(m_menuPanel->top());
     button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
     button->setMargin(y += 30);
     m_menuPanel->addChild(button);
 
     button = UIButtonPtr(new UIButton("Info"));
-    button->anchorLeft(m_menuPanel->left());
     button->anchorTop(m_menuPanel->top());
     button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
     button->setMargin(y += 30);
diff --git a/src/menustate.h b/src/menustate.h
index 4791b8b3..686e8569 100644
--- a/src/menustate.h
+++ b/src/menustate.h
@@ -40,7 +40,7 @@ public:
     void onLeave();
 
     void onClose();
-    void onInputEvent(InputEvent *event);
+    void onInputEvent(const InputEvent& event);
     void onResize(const Size& size);
 
     void render();
diff --git a/src/teststate.cpp b/src/teststate.cpp
index 59d333f8..7cc25f29 100644
--- a/src/teststate.cpp
+++ b/src/teststate.cpp
@@ -43,7 +43,7 @@ void TestState::onClose()
     g_engine.stop();
 }
 
-void TestState::onInputEvent(InputEvent* event)
+void TestState::onInputEvent(const InputEvent& event)
 {
 
 }
diff --git a/src/teststate.h b/src/teststate.h
index 4b33de8c..aba4aab9 100644
--- a/src/teststate.h
+++ b/src/teststate.h
@@ -36,7 +36,7 @@ public:
     void onLeave();
 
     void onClose();
-    void onInputEvent(InputEvent *event);
+    void onInputEvent(const InputEvent& event);
     void onResize(const Size& size);
 
     void render();