public function prepareSave($parentRow, $postData)
{
$row = $this->_getRowByParentRow($parentRow);
if (!$row) {
throw new Kwf_Exception('Can\'t find row.');
} else {
if (!$row instanceof Kwf_Model_Row_Interface) {
throw new Kwf_Exception('Row must be a Kwf_Model_Row_Interface.');
}
}
parent::prepareSave($parentRow, $postData);
}