/**
  * Renders qty column
  *
  * @param   Varien_Object $row
  * @return  string
  */
 public function render(Varien_Object $row)
 {
     $isDisabled = $row->getCode() == Enterprise_Checkout_Helper_Data::ADD_ITEM_STATUS_FAILED_SKU || $row->getIsConfigureDisabled() || $row->getIsQtyDisabled();
     $html = '<input type="text" ';
     $html .= 'name="' . $this->getColumn()->getId() . '" ';
     $html .= 'value="' . $row->getData($this->getColumn()->getIndex()) . '" ';
     $html .= $isDisabled ? 'disabled="disabled" ' : '';
     $html .= 'class="input-text ' . $this->getColumn()->getInlineCss() . '"/>';
     return $html;
 }