public function sortableAction ($name)
    {
        $event = new RowPositionChangeEvent(
            $name, $this->getRequest()->get('row_id'), 
            $this->getRequest()->get('row_position')
        );
        
        $this->container->get('event_dispatcher')->dispatch(DataGridEvents::onRowPositionChange, $event);
        
        return new JsonResponse($event->getExtraData());
    }