public function bootstrap()
    {
        $this->fireBootingCallbacks();

        Form::registerBuiltinFields();

        Grid::registerColumnDisplayer();

        Grid\Filter::registerFilters();

        require config('admin.bootstrap', admin_path('bootstrap.php'));

        $assets = Form::collectFieldAssets();

        self::css($assets['css']);
        self::js($assets['js']);

        $this->fireBootedCallbacks();
    }