protected function _ppAddContentCategories()
    {
        // load content pages for adding them into menu tree
        $oContentList = oxNew(\OxidEsales\Eshop\Application\Model\ContentList::class);
        $oContentList->loadCatMenues();

        foreach ($oContentList as $sCatId => $aContent) {
            if (array_key_exists($sCatId, $this->_aArray)) {
                $this[$sCatId]->setContentCats($aContent);
            }
        }
    }