Removing old elements from menu.dataDescriptor

Can you provide code of your implementation of MenuBar / Menu / PopupMenu no idea what component are you using???

public class RollOverMenuBar extends MenuBar {
public function RollOverMenuBar () {
super();
addEventListener(MenuEvent.ITEM_ROLL_OVER, mouseRollHandler);
}

private function mouseRollHandler(event:MenuEvent):void{
if(event.item.hasOwnProperty("children")){
displayMenus(event.index);
}
}

 private function displayMenus(index:Number):void
  {
 isMenuHide = false;
  selectedIndex = index;
 var item:IMenuBarItemRenderer = menuBarItems[index];
 var menu:Menu = getMenuAt(index);
 if (!menu.parent)
 {
  menu.focusEnabled = true;
  PopUpManager.addPopUp(menu, this, false);
  menu.addEventListener(MenuEvent.MENU_HIDE, menuHide, false, EventPriority.DEFAULT_HANDLER);
  }
       
  var pt:Point = new Point(0, 0);
    menu.show(pt.x, pt.y);
    }
 private  function menuHide(event:MenuEvent):void
    {
   var menutoremove:Menu = Menu(event.target);
    isMenuHide = true;
   PopUpManager.removePopUp(menutoremove);

      }      
      
}