code: public function render($view, array $parameters = array(), Response $response = null)
      {
          $parameters['base_template'] = isset($parameters['base_template']) ? $parameters['base_template'] : $this->getBaseTemplate();
          $parameters['admin_pool']    = $this->get('sonata.admin.pool');
  
          return parent::render($view, $parameters);
      }
docs: Render a view
  
  @param string   $view       Twig view
  @param array    $parameters View parameters
  @param Response $response   Response
  
  @return Response