public function RenderChildCategories($sListFilterItemId = false, $bHideEmptyCategories = false, $bShowArticleCount = false, $iLevelCount = 1)
    {
        $sHtml = '';
        if (!is_null($this->oChildCategoryTreeList)) {
            $this->oChildCategoryTreeList->GoToStart();
            while ($oChildCategoryTree = $this->oChildCategoryTreeList->Next()) {
                $sHtml .= $oChildCategoryTree->Render($sListFilterItemId, $bHideEmptyCategories, $bShowArticleCount, $iLevelCount);
            }
        }

        return $sHtml;
    }