public static $url_handlers = array(
        ''                                         => 'index',
        '$CarURL/$ModelURL/$CategoryURL/$PartURL!' => 'getPartsPage',
        '$CarURL/$ModelURL/$CategoryURL!'          => 'getCategoryPage',
        '$CarURL/$ModelURL!'                       => 'getCarsPage',
        '$CarURL!'                                 => 'getCarsPage'
    );


  public function getCategoryPage($request)
    {

       ..////

            return $this->customise($CarModel)->renderWith(array('Category_Page', 'Page'));

        }
    }