private function getCustomFieldsList()
 {
     $fman = new FieldList();
     $fields = $fman->getAllFieldsInfo();
     for ($i = 0; $i < count($fields); $i++) {
         $id = $fields[$i]['id'];
         $fields[$i]['standard'] = false;
         $fields[$i]['id'] = _CUSTOM_FIELDS_PREFIX . '_' . $id;
     }
     return $fields;
 }