/**
  * @throws BaseModuleNavigationIDMissingException
  */
 public static function downwards()
 {
     if ($_GET['id']) {
         $module_navigation = new ModuleNavigation($_GET['id']);
         $paramquery = $_GET;
         unset($paramquery['action']);
         unset($paramquery['id']);
         $params = http_build_query($paramquery, '', '&');
         if ($module_navigation->downwards()) {
             Common_IO::step_proceed($params, "Downwards", "Operation Successful", null);
         } else {
             Common_IO::step_proceed($params, "Downwards", "Operation Failed", null);
         }
     } else {
         throw new BaseModuleNavigationIDMissingException();
     }
 }