public function index()
{
$brandDAO = new BrandDAO(DataSource::getInstance());
$this->registry->template->brands = $brandDAO->findByAll_Show();
$this->registry->template->tile_title = 'Danh sách nhãn hiệu';
$this->registry->template->tile_content = 'admin/brand-index.php';
$this->registry->template->show('admin/layout/admin.php');
}