public synchronized void addMouseWheelListener(MouseWheelListener l)
public synchronized void addMouseWheelListener(MouseWheelListener listener)
  public synchronized void addMouseWheelListener(MouseWheelListener l)  {		mouseWheelListener = AWTEventMulticaster.add(mouseWheelListener, l);		if (mouseWheelListener != null)			enableEvents(AWTEvent.MOUSE_WHEEL_EVENT_MASK);	}