     [ArrayElementType("mx.core.IVisualElement")]
     
     /**
+     *  The set of components to include in the navigationGroup of the
+     *  ActionBar. The location and appearance of the navigationGroup of the
+     *  ActionBar container is determined by the
+     *  spark.skins.mobile.ActionBarSkin.
+     *  The default ActionBarSkin class defines the navigationGroup to appear
+     *  to the left of the title display area of the ActionBar.
+     *  Create a custom skin to change the default location and appearance of
+     *  the navigationGroup.
+     *  
+     *  @default null
+     *
+     *  @see spark.skins.mobile.ActionBarSkin
+     *  
      *  @langversion 3.0
      *  @playerversion Flash 10
      *  @playerversion AIR 2.5

    //
    //--------------------------------------------------------------------------
    
    private var _dataProvider:ViewNavigator;
    
    //--------------------------------------------------------------------------
    //
    //  Skin parts 

        }
    }
    
    /**
     *  @private
     */
    override protected function partAdded(partName:String, instance:Object):void
    {
        super.partAdded(partName, instance);
