protected function deleteNewItemGroup()
 {
     if (!is_array($_POST["grp_id"])) {
         return $this->listNewItemGroups();
     }
     include_once "Services/Repository/classes/class.ilObjRepositorySettings.php";
     foreach ($_POST["grp_id"] as $grp_id) {
         ilObjRepositorySettings::deleteNewItemGroup($grp_id);
     }
     ilUtil::sendSuccess($this->lng->txt("settings_saved"), true);
     $this->ctrl->redirect($this, "listNewItemGroups");
 }