ListView RequestList = new ListView();
  ListView ResponseList = new ListView();
  AxXtremeSuiteControls.AxListBox BothList = new AxXtremeSuiteControls.AxListBox();
  private void DockingPaneManager_AttachPaneEvent(object sender, AxXtremeDockingPane._DDockingPaneEvents_AttachPaneEvent e)
  {
   switch (e.item.Id - 1)
   {
    case 0:
     {
      e.item.Handle = RequestList.Handle.ToInt32();
      break;
     }
    case 1:
     {
      e.item.Handle = ResponseList.Handle.ToInt32();
      break;
     }
    case 2:
     {
      e.item.Handle = BothList.Handle.ToInt32();    
      break;
     }
    default:
     break;
   }
  }