_film->Changed.connect (boost::bind (&FilmViewer::film_changed, this, _1));
_player->Changed.connect (boost::bind (&FilmViewer::player_changed, this, _1));
_film->Changed.connect (boost::bind (&FilmViewer::film_changed, this, _1));
_player->Changed.connect (boost::bind (&FilmViewer::player_changed, this, _1));