/**
  * @return {PjaxResponseNegotiator}
  *
  * @see LeftAndMain::getResponseNegotiator()
  */
 public function getResponseNegotiator()
 {
     $neg = parent::getResponseNegotiator();
     $controller = $this;
     $neg->setCallback('CurrentForm', function () use(&$controller) {
         return $controller->renderWith($controller->getTemplatesWithSuffix('_Content'));
     });
     return $neg;
 }