yii\grid\GridView::renderSection PHP Method

    public function renderSection($name)
    {
        switch ($name) {
            case '{errors}':
                return $this->renderErrors();
            default:
                return parent::renderSection($name);
        }
    }

 public function renderSection($name)
 {
     if ($name == '{tools}') {
         return $this->renderTools();
     } else {
         return parent::renderSection($name);
     }
 }