public void addPropertyChangeListener(ScenePropertyChangeListener listener){
  if (listener != null) {
    logger.log(Level.FINE,"Add property listener {0}",listener);
    listeners.add(listener);
  }
}

public void addPropertyChangeListener ( ScenePropertyChangeListener listener ) { if ( listener != null ) { logger . log ( Level . FINE , "Add property listener {0}" , listener ) ; listeners . add ( listener ) ; } }
add a scenepropertychangelistener to listen for changes of this propety . see the " prop_xxx " properties for a list of change callback types .
