protected function _isMemberOfIdps(EngineBlock_VirtualOrganization $virtualOrganization, $idp)
 {
     $voIdps = $virtualOrganization->getIdps();
     foreach ($voIdps as $voIdp) {
         /**
          * @var EngineBlock_VirtualOrganization_Idp $voIdp
          */
         if ($voIdp->entityId === $idp) {
             return true;
         }
     }
     return false;
 }