code: @Override
  	public void onMouseUp(MouseUpEvent event) {
  		if (dragging) {
  			setDragging(false);
  			draggingMask.getRenderable().removeFromParent();
  			draggingMask = null;
  			onDragStop(event.getClientX(), event.getClientY());
  			release(invisibleClickArea);
  		}
  	}
docs: {@inheritDoc}