Prado\Web\UI\WebControls\TItemDataRenderer::setItemIndex PHP Метод

If the item is not in the item collection (e.g. it is a header item), -1 should be used.

public setItemIndex ( $value )

    public function setItemIndex($value)
    {
        $this->_itemIndex = TPropertyValue::ensureInteger($value);
    }

TItemDataRenderer