// Event support methods
//
public void fireGraphicsNodeChangeStarted(Rectangle2D from,
Rectangle2D to) {
if (changeStartedEvent == null)
changeStartedEvent = new GraphicsNodeChangeEvent
(this, GraphicsNodeChangeEvent.CHANGE_STARTED);
changeStartedEvent.setFrom(from);
changeStartedEvent.setTo(to);
fireGraphicsNodeChangeStarted(changeStartedEvent);
}