     /**
      *  @private
      */
-    private function dataGroup_rendererAddHandler(event:RendererExistenceEvent):void
-    {
+    override protected function dataGroup_rendererAddHandler(event:RendererExistenceEvent):void
+    {
+        super.dataGroup_rendererAddHandler(event);
+        
         const renderer:IVisualElement = event.renderer; 
         if (renderer)
         {

    /**
     *  @private
     */
    private function dataGroup_rendererRemoveHandler(event:RendererExistenceEvent):void
    {        
        const renderer:IVisualElement = event.renderer;
        if (renderer)
            renderer.removeEventListener(MouseEvent.CLICK, item_clickHandler);

    }
    
    /**
     *  @private 
     *  Detected changes to iconPlacement and update as necessary.
     */ 
