protected function addCategoryGroup()
    {
        $this->controlAccess('category_group_add');

        if ($this->category_group->add($this->getSubmitted())) {
            $this->redirect('admin/content/category-group', $this->text('Category group has been added'), 'success');
        }

        $this->redirect('', $this->text('Category group has not been added'), 'warning');
    }