if (!tableheader.getReorderingAllowed())
TreePath path = tree.getPathForLocation(e.getX(), e.getY());  if(path == null)
			public void mouseClicked(MouseEvent e) {				if (!tableheader.getReorderingAllowed())					return;				if (e.getClickCount()==2)					SorterDialog.getInstance().setVisible(true);			}