/**
  * Method to instantiate the view.
  *
  * @param   ModelInterface     $model     The model object.
  * @param   RendererInterface  $renderer  The renderer interface.
  *
  * @since   1.0
  */
 public function __construct(ModelInterface $model = null, RendererInterface $renderer = null)
 {
     $model = $model ?: new TrackerDefaultModel();
     if (is_null($renderer)) {
         $renderer = new Twig(array('templates_base_dir' => JPATH_TEMPLATES, 'environment' => array('debug' => true)));
     }
     parent::__construct($model, $renderer);
 }