      *  @playerversion AIR 2.5
      *  @productversion Flex 4.5
      */
-    public function backKeyHandler():void
-    {
-    }
-    
-    /**
+    mx_internal function backKeyHandler():void
+    {
+    }
+    
+    /**
+     *  @private
      *  This method checks if the current view can be removed
-     *  from the display list.
+     *  from the display list. This is mx_internal because the
+     *  TabbedViewNavigator needs to call it on its children.
      * 
      *  @return Returns true if the screen can be removed
      *  

        _transitionsEnabled = value;
    }
    
    //----------------------------------
    //  useDefaultTransitions
    //----------------------------------
    
    private var _useDefaultTransitions:Boolean = true;
    
    /**
     *  This flag indicates whether the navigator should play its
     *  built-in default animations for its navigation operations.
     *  If set to false, animations will not be played when a view
     *  is changed unless passed as the <code>transition</code> parameter 
     *  for one of the navigation operations.
     *  
     *  @default true
     * 
     *  @langversion 3.0
     *  @playerversion Flash 10.1
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */ 
    public function get useDefaultTransitions():Boolean
    {
        return _useDefaultTransitions;
    }
    
    /**
     *  @private
     */
    public function set useDefaultTransitions(value:Boolean):void
    {
        _useDefaultTransitions = value;
    }
    
    //--------------------------------------------------------------------------
    //
    // Public Methods

    }
    
    //----------------------------------
    //  lastAction
    //----------------------------------
    
    private var _lastAction:String = ViewNavigatorAction.NONE;
    
    /**
     *  @private
     *  The last action performed by the navigator.
     *
     *  @see spark.components.supportClasses.ViewNavigatorAction
     */
    mx_internal function get lastAction():String
    {
        return _lastAction;
    }
    
    /**
     *  @private
     */ 
    mx_internal function set lastAction(value:String):void
    {
        _lastAction = value;    
    }
    
    //----------------------------------
    //  navigationStack
    //----------------------------------
    
