如何在GTK +中为GtkToggleButton设置组(就像GtkRadioButton那样)？

#include <gtk/gtk.h>

int main(int argc, char *argv[]) {
    GtkWidget *window;
    GtkWidget *box;
    GtkWidget *toggle_button1;
    GtkWidget *toggle_button2;
    GtkWidget *toggle_button3;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "Toggle Button Group");
    gtk_window_set_default_size(GTK_WINDOW(window), 300, 100);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 5);
    gtk_container_add(GTK_CONTAINER(window), box);

    toggle_button1 = gtk_toggle_button_new_with_label("Button 1");
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(toggle_button1), TRUE);
    gtk_box_pack_start(GTK_BOX(box), toggle_button1, TRUE, TRUE, 0);

    toggle_button2 = gtk_toggle_button_new_with_label("Button 2");
    gtk_box_pack_start(GTK_BOX(box), toggle_button2, TRUE, TRUE, 0);

    toggle_button3 = gtk_toggle_button_new_with_label("Button 3");
    gtk_box_pack_start(GTK_BOX(box), toggle_button3, TRUE, TRUE, 0);

    // 将toggle_button2添加到toggle_button1的组中
    gtk_toggle_button_set_group(GTK_TOGGLE_BUTTON(toggle_button2), gtk_toggle_button_get_group(GTK_TOGGLE_BUTTON(toggle_button1)));

    // 将toggle_button3添加到toggle_button1的组中
    gtk_toggle_button_set_group(GTK_TOGGLE_BUTTON(toggle_button3), gtk_toggle_button_get_group(GTK_TOGGLE_BUTTON(toggle_button1)));

    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}

gcc `pkg-config --cflags --libs gtk+-3.0` -o toggle_button_group toggle_button_group.c

./toggle_button_group