gtk_combo_box_set_active(visibility, 0);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dia)->vbox), GTK_WIDGET(visibility), FALSE, FALSE, 0);
gtk_combo_box_set_active(visibility, 0);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dia)->vbox), GTK_WIDGET(visibility), FALSE, FALSE, 0);