Prado\Web\UI\TControlCollection::insertAt PHP Метод

    public function insertAt($index, $item)
    {
        if ($item instanceof TControl) {
            parent::insertAt($index, $item);
            $this->_o->addedControl($item);
        } else {
            if (is_string($item) || $item instanceof IRenderable) {
                parent::insertAt($index, $item);
            } else {
                throw new TInvalidDataTypeException('controlcollection_control_required');
            }
        }
    }

 /**
  * Inserts an item at the specified position.
  * This overrides the parent implementation by performing additional
  * operations for each newly added table cell.
  * @param integer the speicified position.
  * @param mixed new item
  * @throws TInvalidDataTypeException if the item to be inserted is not a TTableCell object.
  */
 public function insertAt($index, $item)
 {
     if ($item instanceof TTableCell) {
         parent::insertAt($index, $item);
     } else {
         throw new TInvalidDataTypeException('tablecellcollection_tablecell_required');
     }
 }