private function registerModuleRegistry()
    {
        $this->app->singleton( 'arbory', function ()
        {
            return new Admin(
                $this->app['sentinel'],
                new Menu(),
                new AssetPipeline()
            );
        } );

        $this->app->singleton( Admin::class, function ()
        {
            return $this->app['arbory'];
        } );
    }