public function index()
    {
        $this->loadModel('User.Acos');
        $tree = $this->Acos
            ->find('threaded')
            ->order(['lft' => 'ASC'])
            ->all();

        $this->title(__d('user', 'Permissions'));
        $this->set(compact('tree'));
        $this->Breadcrumb
            ->push('/admin/user/manage')
            ->push(__d('user', 'Permissions'), ['plugin' => 'User', 'controller' => 'permissions', 'action' => 'index']);
    }