MouseListener shootTarget = new MouseAdapter() {
  public void mouseClicked(MouseEvent e)
  {
    if (currentTarget != null) {
     int nBoxes =
        currentTarget.getComponentCount();
     if (nBoxes == e.getClickCount()) {
	   currentTarget.removeAll();
	   currentTarget.getToolkit().beep();
	   currentTarget.repaint();
     }
    }
   }
};