      *  @playerversion AIR 2.5
      *  @productversion Flex 4.5
      */ 
-    protected function addApplicationListeners():void
+    private function addApplicationListeners():void
     {
         // Add device event listeners
         systemManager.stage.addEventListener(KeyboardEvent.KEY_DOWN, deviceKeyDownHandler);

    //  Properties
    //
    //--------------------------------------------------------------------------

    //----------------------------------
    //  persistenceManager
    //----------------------------------

        if (value == _persistenceManager)
            return;
        
        if (_persistenceManager)
            _persistenceManager.flush();
        
        _persistenceManager = value;
    }
