ui->menu_bar = GTK_WIDGET(gtk_builder_get_object(builder, "menu_bar"));
ui->main_box = GTK_WIDGET(gtk_builder_get_object(builder, "main_box"));
ui->menu_bar = GTK_WIDGET(gtk_builder_get_object(builder, "menu_bar"));
ui->main_box = GTK_WIDGET(gtk_builder_get_object(builder, "main_box"));