function _valid_perform()
 {
     if (!isset($_REQUEST['class_id'])) {
         return false;
     }
     $data = $this->_export();
     $access_policy =& access_policy::instance();
     $access_policy->save_group_action_access($_REQUEST['class_id'], $data['policy']);
     close_popup_no_parent_reload();
 }
 function perform()
 {
     close_popup_no_parent_reload();
     exit;
 }