diff --git a/src/framework/engine.cpp b/src/framework/engine.cpp
index 87ac4cbb..0e82e9ed 100644
--- a/src/framework/engine.cpp
+++ b/src/framework/engine.cpp
@@ -33,8 +33,6 @@
 #include "net/connections.h"
 #include "ui/uicontainer.h"
 
-#define MINIMUN_UPDATE_DELAY 50
-
 Engine g_engine;
 
 void Engine::init()
@@ -57,17 +55,11 @@ void Engine::terminate()
 void Engine::run()
 {
     int ticks = Platform::getTicks();
-    int lastUpdateTicks = ticks;
     int lastFpsTicks = ticks;
-    int updateElapsedTicks = ticks;
     int frameCount = 0;
     int fps = 0;
     m_running = true;
 
-    // before redering do the first update
-    update(ticks, 0);
-    lastUpdateTicks = ticks;
-
     while(!m_stopping) {
         // poll platform events
         Platform::poll();
@@ -75,18 +67,11 @@ void Engine::run()
         // poll network events
         g_connections.poll();
 
-        // update before redering
         ticks = Platform::getTicks();
 
         // poll diaptcher tasks
         g_dispatcher.poll(ticks);
 
-        updateElapsedTicks = ticks - lastUpdateTicks;
-        if(updateElapsedTicks >= MINIMUN_UPDATE_DELAY) {
-            update(ticks, updateElapsedTicks);
-            lastUpdateTicks = ticks;
-        }
-
         // render only when visible
         if(Platform::isWindowVisible()) {
             // calculate and fps
@@ -140,13 +125,6 @@ void Engine::render()
     g_graphics.endRender();
 }
 
-void Engine::update(int ticks, int elapsedTicks)
-{
-    if(m_currentState)
-        m_currentState->update(ticks, elapsedTicks);
-    g_ui->update(ticks, elapsedTicks);
-}
-
 void Engine::onClose()
 {
     if(m_currentState)
@@ -156,7 +134,7 @@ void Engine::onClose()
 void Engine::onResize(const Size& size)
 {
     g_graphics.resize(size);
-    g_ui->resize(size);
+    g_ui->setSize(size);
 
     if(m_currentState)
         m_currentState->onResize(size);
diff --git a/src/framework/engine.h b/src/framework/engine.h
index 7f2063dd..29025430 100644
--- a/src/framework/engine.h
+++ b/src/framework/engine.h
@@ -68,8 +68,6 @@ public:
 private:
     /// Called to render every frame
     void render();
-    /// Called between renders
-    void update(int ticks, int elapsedTicks);
 
     bool m_stopping;
     bool m_running;
diff --git a/src/framework/gamestate.h b/src/framework/gamestate.h
index ba0ff028..2b007688 100644
--- a/src/framework/gamestate.h
+++ b/src/framework/gamestate.h
@@ -43,7 +43,6 @@ public:
     virtual void onResize(const Size& size) = 0;
 
     virtual void render() = 0;
-    virtual void update(int ticks, int elapsedTicks) = 0;
 };
 
 #endif // GAMESTATE_H
diff --git a/src/framework/platform.h b/src/framework/platform.h
index 2e2f1d5e..fb61d8af 100644
--- a/src/framework/platform.h
+++ b/src/framework/platform.h
@@ -72,7 +72,7 @@ namespace Platform
     void swapBuffers();
 
     /// Get the app user directory, the place to save files configurations files
-    const char *getAppUserDir();
+    std::string getAppUserDir();
 }
 
 #endif // PLATFORM_H
diff --git a/src/framework/rect.h b/src/framework/rect.h
index 90857df0..44c12018 100644
--- a/src/framework/rect.h
+++ b/src/framework/rect.h
@@ -54,6 +54,8 @@ public:
     inline T top() const { return y1; }
     inline T right() const { return x2; }
     inline T bottom() const { return y2; }
+    inline T horizontalCenter() const { return x1 + (x2 - x1)/2; }
+    inline T verticalCenter() const { return y1 + (y2 - y1)/2; }
     inline T x() const { return x1; }
     inline T y() const { return y1; }
     inline TPoint<T> topLeft() const { return TPoint<T>(x1, y1); }
@@ -108,6 +110,16 @@ public:
         x2 = x1 + w;
         y2 = y1 + h;
     }
+    inline void moveHorizontalCenter(T x) {
+        T w = x2 - x1;
+        x1 = x - w/2;
+        x2 = x1 + w;
+    }
+    inline void moveVerticalCenter(T y) {
+        T h = y2 - y1;
+        y1 = y - h/2;
+        y2 = y1 + h;
+    }
 
     inline bool contains(const TPoint<T> &p, bool insideOnly = false) const {
         T l, r;
diff --git a/src/framework/ui/uicontainer.cpp b/src/framework/ui/uicontainer.cpp
index 34de5c7e..51e085a2 100644
--- a/src/framework/ui/uicontainer.cpp
+++ b/src/framework/ui/uicontainer.cpp
@@ -30,11 +30,6 @@ void UIContainer::addChild(UIElementPtr child)
 {
     m_children.push_back(child);
     child->setParent(asUIContainer());
-
-    // adjust child rect
-    Rect childRect = child->getRect();
-    childRect.translate(m_rect.topLeft());
-    child->setRect(childRect);
 }
 
 void UIContainer::removeChild(UIElementPtr child)
@@ -42,12 +37,14 @@ void UIContainer::removeChild(UIElementPtr child)
     if(m_activeElement == child)
         setActiveElement(UIElementPtr());
     m_children.remove(child);
+    if(child->getParent() == shared_from_this())
+        child->setParent(UIContainerPtr());
 }
 
-UIElementPtr UIContainer::getChildByName(const std::string& name) const
+UIElementPtr UIContainer::getChildById(const std::string& id) const
 {
     for(auto it = m_children.begin(); it != m_children.end(); ++it) {
-        if((*it)->getName() == name) {
+        if((*it)->getId() == id) {
             return (*it);
             break;
         }
@@ -55,45 +52,6 @@ UIElementPtr UIContainer::getChildByName(const std::string& name) const
     return UIElementPtr();
 }
 
-
-void UIContainer::setRect(const Rect& rect)
-{
-    // update children rect
-    for(auto it = m_children.begin(); it != m_children.end(); ++it) {
-        const UIElementPtr& child = (*it);
-
-        // transforme child rect
-        Rect childRect = child->getRect();
-        childRect.translate(-m_rect.topLeft());
-        childRect.translate(rect.topLeft());
-        child->setRect(childRect);
-    }
-
-    m_rect = rect;
-}
-
-void UIContainer::resize(const Size& size)
-{
-    Rect newRect = m_rect;
-    newRect.setSize(size);
-    setRect(newRect);
-}
-
-void UIContainer::move(const Point& trans)
-{
-    Rect newRect = m_rect;
-    newRect.translate(trans);
-    setRect(newRect);
-}
-
-void UIContainer::moveTo(const Point& pos)
-{
-    Rect newRect = m_rect;
-    newRect.moveTo(pos);
-    setRect(newRect);
-
-}
-
 void UIContainer::render()
 {
     UIElement::render();
@@ -103,11 +61,6 @@ void UIContainer::render()
     }
 }
 
-void UIContainer::update(int ticks, int elapsedTicks)
-{
-
-}
-
 bool UIContainer::onInputEvent(InputEvent* event)
 {
     return false;
diff --git a/src/framework/ui/uicontainer.h b/src/framework/ui/uicontainer.h
index 5629a51d..59af838c 100644
--- a/src/framework/ui/uicontainer.h
+++ b/src/framework/ui/uicontainer.h
@@ -36,20 +36,14 @@ public:
     UIContainer(UI::EElementType type = UI::Container) : UIElement(type) { }
     virtual ~UIContainer() { }
 
-    virtual void addChild(UIElementPtr child);
-    virtual void removeChild(UIElementPtr child);
-    virtual UIElementPtr getChildByName(const std::string& name) const;
-
-    virtual void setRect(const Rect& rect);
-    virtual void resize(const Size& size);
-    virtual void move(const Point& trans);
-    virtual void moveTo(const Point& pos);
+    void addChild(UIElementPtr child);
+    void removeChild(UIElementPtr child);
+    UIElementPtr getChildById(const std::string& id) const;
 
     virtual void render();
-    virtual void update(int ticks, int elapsedTicks);
     virtual bool onInputEvent(InputEvent *event);
 
-    virtual void setActiveElement(UIElementPtr activeElement);
+    void setActiveElement(UIElementPtr activeElement);
     UIElementPtr getActiveElement() const { return m_activeElement; }
 
     virtual UI::EElementType getElementType() const { return UI::Container; }
diff --git a/src/framework/ui/uielement.cpp b/src/framework/ui/uielement.cpp
index 24ff0cdb..59aa1e2a 100644
--- a/src/framework/ui/uielement.cpp
+++ b/src/framework/ui/uielement.cpp
@@ -24,9 +24,39 @@
 
 #include "uielement.h"
 #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) :
-    m_type(type)
+    m_type(type),
+    m_marginLeft(0),
+    m_marginRight(0),
+    m_marginTop(0),
+    m_marginBottom(0)
 {
     // set default skin
     setSkin(g_uiSkins.getElementSkin(type));
@@ -42,7 +72,7 @@ bool UIElement::setSkin(const std::string& skinName)
 void UIElement::setSkin(UIElementSkin* skin)
 {
     if(skin && !m_rect.isValid()) {
-        m_rect.setSize(skin->getDefaultSize());
+        setSize(skin->getDefaultSize());
     }
     m_skin = skin;
 }
@@ -53,3 +83,75 @@ void UIElement::render()
         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 37997c3b..6578c84b 100644
--- a/src/framework/ui/uielement.h
+++ b/src/framework/ui/uielement.h
@@ -29,13 +29,45 @@
 #include "../input.h"
 #include "../rect.h"
 #include "uiconstants.h"
-#include "uielementskin.h"
+
+class UIElementSkin;
 
 class UIContainer;
 typedef std::shared_ptr<UIContainer> UIContainerPtr;
+typedef std::weak_ptr<UIContainer> UIContainerWeakPtr;
 
 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>
 {
@@ -44,7 +76,6 @@ public:
     virtual ~UIElement() { }
 
     virtual void render();
-    virtual void update(int ticks, int elapsedTicks) { }
     virtual bool onInputEvent(InputEvent *event) { return false; }
 
     bool setSkin(const std::string& skinName);
@@ -52,32 +83,67 @@ public:
     UIElementSkin *getSkin() { return m_skin; }
 
     virtual void setParent(UIContainerPtr parent) { m_parent = parent; }
-    UIContainerPtr getParent() const { return m_parent; }
+    UIContainerPtr getParent() const { return m_parent.lock(); }
+
+    void setId(const std::string& id) { m_id = id; }
+    const std::string& getId() const { return m_id; }
 
-    virtual void setName(const std::string& name) { m_name = name; }
-    const std::string& getName() const { return m_name; }
+    void setSize(const Size& size);
+    Size getSize() { return m_rect.size(); }
 
-    virtual void setRect(const Rect& rect) { m_rect = rect; }
+    void setRect(const Rect& rect);
     const Rect& getRect() const{ return m_rect; }
 
-    virtual void setActive(bool active) { m_active = active; }
+    void setActive(bool active) { m_active = active; }
     bool isActive() const { return m_active; }
 
-    virtual void setVisible(bool visible) { m_visible = visible; }
+    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);
+
     UI::EElementType m_type;
-    UIContainerPtr m_parent;
+    UIContainerWeakPtr m_parent;
     UIElementSkin *m_skin;
     Rect m_rect;
-    std::string m_name;
+    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;
 };
 
 #endif // UIELEMENT_H
diff --git a/src/framework/ui/uiskins.cpp b/src/framework/ui/uiskins.cpp
index b58d39d5..cf9c7e6a 100644
--- a/src/framework/ui/uiskins.cpp
+++ b/src/framework/ui/uiskins.cpp
@@ -29,6 +29,12 @@
 
 UISkins g_uiSkins;
 
+UISkins::~UISkins()
+{
+    for(auto it = m_elementSkins.begin(); it != m_elementSkins.end(); ++it)
+        delete (*it);
+}
+
 bool UISkins::load(const std::string& file)
 {
     std::string fileContents = g_resources.loadTextFile(file);
diff --git a/src/framework/ui/uiskins.h b/src/framework/ui/uiskins.h
index 6260c6b9..3d41740c 100644
--- a/src/framework/ui/uiskins.h
+++ b/src/framework/ui/uiskins.h
@@ -35,6 +35,7 @@ class UISkins
 {
 public:
     UISkins() { }
+    ~UISkins();
 
     bool load(const std::string& file);
 
diff --git a/src/framework/win32platform.cpp b/src/framework/win32platform.cpp
index 3606ddcb..a799983c 100644
--- a/src/framework/win32platform.cpp
+++ b/src/framework/win32platform.cpp
@@ -351,13 +351,13 @@ bool Platform::isWindowMaximized()
     return win32.maximized;
 }
 
-const char *Platform::getAppUserDir()
+std::string Platform::getAppUserDir()
 {
     std::stringstream sdir;
     sdir << PHYSFS_getUserDir() << "/." << win32.appName << "/";
     if((mkdir(sdir.str().c_str()) != 0) && (errno != EEXIST))
         logError("Couldn't create directory for saving configuration file. (%s)", sdir.str().c_str());
-    return sdir.str().c_str();
+    return sdir.str();
 }
 
 LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
diff --git a/src/framework/x11platform.cpp b/src/framework/x11platform.cpp
index 6887249f..ba08f708 100644
--- a/src/framework/x11platform.cpp
+++ b/src/framework/x11platform.cpp
@@ -826,11 +826,11 @@ bool Platform::isWindowMaximized()
     return ret;
 }
 
-const char *Platform::getAppUserDir()
+std::string Platform::getAppUserDir()
 {
     std::stringstream sdir;
     sdir << PHYSFS_getUserDir() << "/." << x11.appName << "/";
     if((mkdir(sdir.str().c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH) != 0) && (errno != EEXIST))
         logError("Couldn't create directory for saving configuration file. (%s)", sdir.str().c_str());
-    return sdir.str().c_str();
+    return sdir.str();
 }
diff --git a/src/menustate.cpp b/src/menustate.cpp
index c88eac3f..d239523d 100644
--- a/src/menustate.cpp
+++ b/src/menustate.cpp
@@ -62,7 +62,7 @@ void MenuState::onInputEvent(InputEvent* event)
 
 void MenuState::onResize(const Size& size)
 {
-    recalculateMenuPanelPosition();
+
 }
 
 void MenuState::render()
@@ -80,55 +80,52 @@ void MenuState::render()
     g_graphics.drawTexturedRect(Rect(0, 0, screenSize), m_background.get(), texCoords);
 }
 
-void MenuState::update(int ticks, int elapsedTicks)
-{
-
-}
-
 void MenuState::createMainMenu()
 {
     UIButtonPtr button;
-    int y = 16;
+    int y = 0;
 
     m_menuPanel = UIPanelPtr(new UIPanel);
     m_menuPanel->setSkin("roundedGridPanel");
-    recalculateMenuPanelPosition();
+    m_menuPanel->anchorLeft(g_ui->left());
+    m_menuPanel->anchorBottom(g_ui->bottom());
+    m_menuPanel->setSize(Size(118, 172));
+    m_menuPanel->setMargin(0, 60, 70, 0);
 
     button = UIButtonPtr(new UIButton("Enter Game"));
-    button->setRect(Rect(16, y, 86, 20));
+    button->anchorLeft(m_menuPanel->left());
+    button->anchorTop(m_menuPanel->top());
+    button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
+    button->setMargin(y += 16);
     m_menuPanel->addChild(button);
-    y += 30;
 
     button = UIButtonPtr(new UIButton("Access Account"));
-    button->setRect(Rect(16, y, 86, 20));
+    button->anchorLeft(m_menuPanel->left());
+    button->anchorTop(m_menuPanel->top());
+    button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
+    button->setMargin(y += 30);
     m_menuPanel->addChild(button);
-    y += 30;
 
     button = UIButtonPtr(new UIButton("Options"));
-    button->setRect(Rect(16, y, 86, 20));
+    button->anchorLeft(m_menuPanel->left());
+    button->anchorTop(m_menuPanel->top());
+    button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
+    button->setMargin(y += 30);
     m_menuPanel->addChild(button);
-    y += 30;
 
     button = UIButtonPtr(new UIButton("Info"));
-    button->setRect(Rect(16, y, 86, 20));
+    button->anchorLeft(m_menuPanel->left());
+    button->anchorTop(m_menuPanel->top());
+    button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
+    button->setMargin(y += 30);
     m_menuPanel->addChild(button);
-    y += 30;
 
     button = UIButtonPtr(new UIButton("Exit Game"));
-    button->setRect(Rect(16, y, 86, 20));
+    button->anchorLeft(m_menuPanel->left());
+    button->anchorTop(m_menuPanel->top());
+    button->anchorHorizontalCenter(m_menuPanel->horizontalCenter());
+    button->setMargin(y += 30);
     m_menuPanel->addChild(button);
-    y += 30;
 
     g_ui->addChild(m_menuPanel);
 }
-
-void MenuState::recalculateMenuPanelPosition()
-{
-    if(m_menuPanel) {
-        // calculate panel rect
-        Size panelSize = Size(117, 171);
-        Rect panelRect = Rect(0, 0, panelSize);
-        panelRect.moveBottomLeft(Point(60, g_graphics.getScreenSize().height() - 70));
-        m_menuPanel->setRect(panelRect);
-    }
-}
\ No newline at end of file
diff --git a/src/menustate.h b/src/menustate.h
index 74b1ddec..4791b8b3 100644
--- a/src/menustate.h
+++ b/src/menustate.h
@@ -44,11 +44,9 @@ public:
     void onResize(const Size& size);
 
     void render();
-    void update(int ticks, int elapsedTicks);
 
 private:
     void createMainMenu();
-    void recalculateMenuPanelPosition();
 
     UIPanelPtr m_menuPanel;
     TexturePtr m_background;
diff --git a/src/teststate.cpp b/src/teststate.cpp
index bb8555b2..59d333f8 100644
--- a/src/teststate.cpp
+++ b/src/teststate.cpp
@@ -57,9 +57,3 @@ void TestState::render()
 {
 
 }
-
-void TestState::update(int ticks, int elapsedTicks)
-{
-
-}
-
diff --git a/src/teststate.h b/src/teststate.h
index 7bab44c0..4b33de8c 100644
--- a/src/teststate.h
+++ b/src/teststate.h
@@ -40,7 +40,6 @@ public:
     void onResize(const Size& size);
 
     void render();
-    void update(int ticks, int elapsedTicks);
 };
 
 #endif // TESTSTATE_H