diff --git a/src/framework/configmanager.cpp b/src/framework/configmanager.cpp
index e3494357..9a5b96da 100644
--- a/src/framework/configmanager.cpp
+++ b/src/framework/configmanager.cpp
@@ -93,12 +93,12 @@ void ConfigManager::setValue(const std::string &key, const char *value)
 
 void ConfigManager::setValue(const std::string &key, int value)
 {
-    setValue(key, boost::lexical_cast<std::string>(value));
+    setValue(key, convertType<std::string, int>(value));
 }
 
 void ConfigManager::setValue(const std::string &key, float value)
 {
-    setValue(key, boost::lexical_cast<std::string>(value));
+    setValue(key, convertType<std::string, float>(value));
 }
 
 void ConfigManager::setValue(const std::string &key, bool value)
@@ -127,7 +127,7 @@ float ConfigManager::getFloat(const std::string &key)
         warning("Config value %s not found", key.c_str());
         return 0;
     }
-    return boost::lexical_cast<float>(iter->second);
+    return convertType<float, std::string>(iter->second);
 }
 
 bool ConfigManager::getBoolean(const std::string &key)
@@ -147,5 +147,5 @@ int ConfigManager::getInteger(const std::string &key)
         warning("Config value %s not found", key.c_str());
         return 0;
     }
-    return boost::lexical_cast<int>(iter->second);
+    return convertType<int, std::string>(iter->second);
 }
diff --git a/src/framework/resourcemanager.cpp b/src/framework/resourcemanager.cpp
index 011abd6e..c239adbb 100644
--- a/src/framework/resourcemanager.cpp
+++ b/src/framework/resourcemanager.cpp
@@ -57,7 +57,7 @@ bool ResourceManager::setWriteDir(const std::string& path)
     return ret;
 }
 
-bool ResourceManager::addToSearchPath(const std::string& path, bool insertInFront)
+bool ResourceManager::addToSearchPath(const std::string& path, bool insertInFront /*= true*/)
 {
     if(!PHYSFS_addToSearchPath(path.c_str(), insertInFront ? 0 : 1)) {
         error("Error while adding \"%s\" to resources search path: %s", path.c_str(), PHYSFS_getLastError());
diff --git a/src/framework/util.h b/src/framework/util.h
index 1e82ff77..b0fffdf7 100644
--- a/src/framework/util.h
+++ b/src/framework/util.h
@@ -33,4 +33,21 @@ std::string vformat(const char *format, va_list args);
 /// Formatting like printf for std::string
 std::string format(const char *format, ...);
 
+/// Convert any data type through boost::lexical_cast
+//TODO: move declatation to util.cpp
+template<class R, class T> 
+R convertType(T t)
+{
+    R r = R();
+    
+    try{
+	r = boost::lexical_cast<R>(t);
+    }
+    catch(boost::bad_lexical_cast bad){
+	//TODO: add an error message
+    }
+    
+    return r;
+}
+
 #endif
\ No newline at end of file
diff --git a/src/framework/win32platform.cpp b/src/framework/win32platform.cpp
index a01bed24..79ae6808 100644
--- a/src/framework/win32platform.cpp
+++ b/src/framework/win32platform.cpp
@@ -288,7 +288,7 @@ void Platform::showMouseCursor()
     ShowCursor(true);
 }
 
-void Platform::setVsync(bool enable)
+void Platform::setVsync(bool enable /*= true*/)
 {
     typedef GLint (*glSwapIntervalProc)(GLint);
     glSwapIntervalProc glSwapInterval = NULL;
diff --git a/src/main.cpp b/src/main.cpp
index a62b63e9..9109a701 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -108,7 +108,7 @@ int main(int argc, const char *argv[])
 
     // state scope
     {
-        std::unique_ptr<MenuState> menuState(new MenuState);
+        std::unique_ptr<MenuState> menuState(new MenuState());
         g_engine.changeState(menuState.get());
 
         Platform::showWindow();
diff --git a/src/menustate.h b/src/menustate.h
index 1f488421..7923fffd 100644
--- a/src/menustate.h
+++ b/src/menustate.h
@@ -35,14 +35,14 @@ public:
     MenuState();
     virtual ~MenuState();
 
-    void onEnter();
-    void onLeave();
+    virtual void onEnter();
+    virtual void onLeave();
 
-    void onClose();
-    void onInputEvent(InputEvent *event);
+    virtual void onClose();
+    virtual void onInputEvent(InputEvent *event);
 
-    void render();
-    void update(int ticks, int elapsedTicks);
+    virtual void render();
+    virtual void update(int ticks, int elapsedTicks);
 
 private:
     TexturePtr m_background;