Author: Adam Piotrowski (adam@wellcommerce.org)
 public function indexAction() : Response
 {
     return $this->displayTemplate('index', ['datagrid' => $this->dataGrid->getInstance()]);
 }
 public function gridAction(Request $request) : Response
 {
     $results = $this->dataGrid->loadResults($request);
     return $this->jsonResponse($results);
 }