protected function getOutputNaviEntry(interface_model $objInstance)
 {
     if ($objInstance instanceof class_module_eventmanager_event) {
         return getLinkAdmin($this->getArrModule("modul"), "listParticipant", "&systemid=" . $objInstance->getSystemid(), $objInstance->getStrDisplayName());
     }
     if ($objInstance instanceof class_module_eventmanager_participant) {
         return getLinkAdmin($this->getArrModule("modul"), "listParticipant", "&systemid=" . $objInstance->getStrPrevId(), $objInstance->getStrDisplayName());
     }
     return "";
 }