code: protected final void firePrimitiveChanged() {
  		final BusChangeEvent event = new BusChangeEvent(
  				// source of the event
  				this,
  				// type of the event
  				BusChangeEventType.change(getClass()),
  				// subobject
  				this,
  				// index in parent
  				indexInParent(),
  				// propertyName
  				null,
  				// old property value
  				null,
  				// new property value
  				null);
  		firePrimitiveChanged(event);
  	}
docs: Fire the event that indicates this object has changed.