code: @Override
  	public void onMouseDown(MouseDownEvent event) {
  		if (isActive()) {
  			if (BboxService.contains(object.getUserBounds(), getUserCoordinate(event))) {
  				dragHandler.onMouseDown(event);
  				event.stopPropagation();
  			}
  		}
  	}
docs: This {@link MouseDownHandler} handler method is called from the
  {@link org.geomajas.graphics.client.controller.DefaultMetaController}.
  
  @param event