/**
  * Renders the markup for the button actions toolbar
  *
  * @return string
  */
 public function renderToolbar()
 {
     if (!$this->showToolbar) {
         return '';
     }
     unset($this->toolbar[self::BTN_CREATE], $this->toolbar[self::BTN_CREATE_ROOT], $this->toolbar[self::BTN_REMOVE]);
     return parent::renderToolbar();
 }