protected function _addNavigationHistory($sNode)
    {
        $myUtilsServer = \OxidEsales\Eshop\Core\Registry::getUtilsServer();

        // store navigation history
        $aHistory = explode('|', $myUtilsServer->getOxCookie('oxidadminhistory'));
        if (!is_array($aHistory)) {
            $aHistory = [];
        }

        if (!in_array($sNode, $aHistory)) {
            $aHistory[] = $sNode;
        }

        $myUtilsServer->setOxCookie('oxidadminhistory', implode('|', $aHistory));
    }