$this->widgetSchema['venue_id'] = new sfWidgetFormFCBKComplete(array(
            'json_url'      => "http://example.com/data.txt",
            'complete_text' => "Kezdjen el írni...",
            'maxitems'      => 1,
            'height'        => 2,
            'model'         => 'Venue',
            'title'         => 'name'
        ));