if (!empty($searchData['orderby']) && $searchData['orderby']->getId() == 10) {
            //@see http://doctrine-orm.readthedocs.org/en/latest/reference/dql-doctrine-query-language.html
            $qb->addSelect('MAX(pc.stock_unlimited) as HIDDEN stock_unlimited_max, MAX(pc.stock) as HIDDEN stock_max');
            $qb->innerJoin('p.ProductClasses', 'pc');
            $qb->andWhere('pc.visible = true');
            $qb->groupBy('p.id');
            $qb->orderBy('stock_unlimited_max', 'DESC');
            $qb->addOrderBy('stock_max', 'DESC');
            $qb->addOrderBy('p.id', 'DESC');

        }