protected function _prepareArrayRow(Varien_Object $row)
 {
     $row->setData('option_extra_attr_' . $this->getRenderer('attribute')->calcOptionHash($row->getAttribute()), 'selected="selected"');
     $row->setData('option_extra_attr_' . $this->getRenderer('searchable')->calcOptionHash($row->getSearchable()), 'selected="selected"');
     $row->setData('option_extra_attr_' . $this->getRenderer('searchable')->calcOptionHash($row->getRetrievable()), 'selected="selected"');
     $row->setData('option_extra_attr_' . $this->getRenderer('order')->calcOptionHash($row->getOrder()), 'selected="selected"');
 }