     }
     
     //----------------------------------
-    //  maintainNavigationStack
-    //----------------------------------
-    private var _maintainNavigationStack:Boolean = true;
-    
-    /**
-     *  This property indicates whether the navigation stack of the view
-     *  should remain intact when the navigator is deactivated by its
-     *  parent navigator.  If set to true, when reactivated the view history
-     *  will remain the same.  If false, the navigator will display the
-     *  first view in its navigation stack.
-     * 
-     *  @default true
-     *  
-     *  @see spark.components.TabbedViewNavigator
-     * 
-     *  @langversion 3.0
-     *  @playerversion Flash 10.1
-     *  @playerversion AIR 2.5
-     *  @productversion Flex 4.5
-     */
-    public function get maintainNavigationStack():Boolean
-    {
-        return _maintainNavigationStack;
-    }
-    
-    /**
-     *  @private
-     */ 
-    public function set maintainNavigationStack(value:Boolean):void
-    {
-        _maintainNavigationStack = value;
-    }
-    
-    //----------------------------------
     //  navigationStack
     //----------------------------------
     

    }
}
}


/**
 * @private
 */
class ViewNavigatorAction
{
    public static const NONE:String = "none";
    public static const PUSH:String = "push";
    public static const POP:String = "pop";
    public static const POP_ALL:String = "popAll";
    public static const POP_TO_FIRST:String = "popToFirst";
    public static const REPLACE_VIEW:String = "replaceView";
    public static const REPLACE_STACK:String = "replaceStack";    
}
			
		if (actionBarVisibilityInvalidated)
            commitVisibilityChanges();
    }
    
    /**
     *  @private
     */ 
    private function get lastActionWasAPop():Boolean
    {
        return ((lastAction == ViewNavigatorAction.POP) ||
            (lastAction == ViewNavigatorAction.POP_ALL) ||
            (lastAction == ViewNavigatorAction.POP_TO_FIRST) ||
            (lastAction == ViewNavigatorAction.REPLACE));
    }
    
    /**
