code: @Override
  	public void fireGraphicalAttributeChanged(String propertyName, Object oldValue, Object newValue) {
  		final BusChangeEvent event = new BusChangeEvent(this,
  				BusChangeEventType.change(getClass()), this,
  				indexInParent(),
  				propertyName,
  				oldValue,
  				newValue);
  		fireGraphicalAttributeChanged(event);
  	}
docs: {@inheritDoc}