     //  activeNavigator
     //----------------------------------
     
+    [Bindable("change")]
     /**
      *  Returns the active navigator for the TabbedViewNavigator.  Only one
      *  navigator can be active at a time.  The active navigator can be

     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */
    protected function calculateFinalUIPositions():void
    {
        var animateTabBarUp:Boolean;
        

    private function visibilityAnimation_completeHandler(event:EffectEvent):void
    {
        event.target.removeEventListener(EffectEvent.EFFECT_END, visibilityAnimation_completeHandler);
        tabBarVisibilityEffect = null;

        if (tabBarProps)
        {
            tabBar.visible = tabBar.includeInLayout = tabBarProps.end.visible;
            tabBar.cacheAsBitmap = tabBarProps.start.cacheAsBitmap;
            tabBarProps = null;
        }
        
        if (contentGroupProps)
        {
            contentGroup.includeInLayout = contentGroupProps.start.includeInLayout;
            contentGroup.cacheAsBitmap = contentGroupProps.start.cacheAsBitmap;
            contentGroupProps = null;
        }
    }
    
    //--------------------------------------------------------------------------
