const ng::level::TYPE current_type = create_engine_.current_level_type();
    const std::vector<ng::create_engine::level_ptr>& levels_unfiltered = create_engine_.get_levels_by_type_unfiltered(current_type);
    const std::vector<ng::create_engine::level_ptr>& levels_filtered = create_engine_.get_levels_by_type(current_type);

    std::vector<bool> filtered = std::transform(
        levels_unfiltered.begin(), levels_filtered.end(), levels_filtered.begin(),
        std::back_inserter(filtered), std::equal<std::shared_ptr<ng::level>>());

    tlistbox& list = find_widget<tlistbox>(&window, "games_list", false).set_row_shown(filtered);