code: protected void onShowPopup(final MouseEvent e)
  	{
  		if (e.isPopupTrigger())
  		{
  			System.out.println(e.getSource());
  			popupMenu.show(e.getComponent(), e.getX(), e.getY());
  		}
  	}
docs: Callback method that is called on show popup.
  
  @param e
  the mouse event