protected function _loadCategoryTree($sActCat)
    {
        /** @var \OxidEsales\Eshop\Application\Model\CategoryList $oCategoryTree */
        $oCategoryTree = oxNew(\OxidEsales\Eshop\Application\Model\CategoryList::class);
        $oCategoryTree->buildTree($sActCat);

        $oParentView = $this->getParent();

        // setting active category tree
        $oParentView->setCategoryTree($oCategoryTree);
        $this->setCategoryTree($oCategoryTree);

        // setting active category
        $oParentView->setActiveCategory($oCategoryTree->getClickCat());
    }