After scrolling popup has wrong postition

Hi Guys, 

I have an FlexTable with some TextFields. This Textfields have a Contextmenu. It's all working fine, but if I scroll down the table and than do a right click my Popup appears at the wrong position. 

Is there any bugfix for this? 

Here is my Popupcode: 

protected void showPopUpMenu( final PropertyValueWidget label, Event event )

  {

    final PopupPanel popupPanel = new PopupPanel( true, true );

    popupPanel.setPopupPosition( event.getClientX(), event.getClientY() );

    //Some more thing to fill the popup

    popupPanel.show();

   }

Thanks in advance 

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