public function thumb($code = null, $width = 100, $height = 100, $mode = 'auto', $extension = 'auto')
    {
        try {
            return $this->findFileObject($code)->outputThumb(
                $width,
                $height,
                compact('mode', 'extension'),
                true
            );
        }
        catch (Exception $ex) {}

        return Response::make(View::make('backend::404'), 404);
    }