Prado\Web\UI\WebControls\TListBox::onPreRender PHP Метод

    public function onPreRender($param)
    {
        parent::onPreRender($param);
        if ($this->getEnabled(true)) {
            $this->getPage()->registerRequiresPostData($this);
        }
    }

 /**
  * Updates the client-side options if the item list has changed after the OnLoad event.
  */
 public function onPreRender($param)
 {
     parent::onPreRender($param);
     $this->getAdapter()->updateListItems();
 }