code: public function showAction(Request $request, Application $app)
      {
          $options = $this->options($request, $app);
  
          return parent::show($options);
      }
docs: Show backend action
  
  @param \Symfony\Component\HttpFoundation\Request $request
  @param \Silex\Application                        $app
  @return \Symfony\Component\HttpFoundation\Response