/**
  * Renders column as input when it is editable
  *
  * @param   Varien_Object $row
  * @return  string
  */
 protected function _getEditableView(Varien_Object $row)
 {
     $value = $row->getData($this->getColumn()->getIndex());
     if (!$row->getIsQtyDecimal() && !is_null($value)) {
         $value = intval($value);
     }
     $class = 'input-text ' . $this->getColumn()->getValidateClass();
     $html = '<input type="text" ';
     $html .= 'name="items[' . $row->getId() . '][' . $this->getColumn()->getId() . ']" ';
     $html .= 'value="' . $value . '" ';
     if ($this->getStatusManager()->getAttributeIsDisabled($this->getColumn()->getId())) {
         $html .= ' disabled="disabled" ';
         $class .= ' disabled ';
     }
     $html .= 'class="' . $class . '" />';
     return $html;
 }