improve vj searching by dynamic_cast
improve vj searching by dynamic_cast

CanalTP/navitia,Tisseo/navitia,kinnou02/navitia,Tisseo/navitia,xlqian/navitia,kinnou02/navitia,xlqian/navitia,xlqian/navitia,kinnou02/navitia,CanalTP/navitia,Tisseo/navitia,kinnou02/navitia,xlqian/navitia,CanalTP/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,CanalTP/navitia,Tisseo/navitia