box->button_add_pool->signal_clicked().connect([this] {
            GtkFileChooserNative *native = gtk_file_chooser_native_new ("Add Pool",
                                      GTK_WINDOW(gobj()),
                                      GTK_FILE_CHOOSER_ACTION_OPEN,
                                      "_Open",
                                      "_Cancel");
            auto chooser = Glib::wrap(GTK_FILE_CHOOSER(native));
            auto filter= Gtk::FileFilter::create();
            filter->set_name("Horizon pool (pool.json)");
            filter->add_pattern("pool.json");
            chooser->add_filter(filter);

            if(gtk_native_dialog_run (GTK_NATIVE_DIALOG (native))==GTK_RESPONSE_ACCEPT) {
                auto path = chooser->get_filename();
                auto mapp = Glib::RefPtr<ProjectManagerApplication>::cast_dynamic(app);
                mapp->add_pool(path);
                update();

            }
        });