Gtk::Window add网格未显示我的子小部件

#include <gtk/gtk.h>

int main(int argc, char *argv[]) {
    gtk_init(&argc, &argv);

    // 创建窗口
    GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "Grid Example");
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    // 创建网格
    GtkWidget *grid = gtk_grid_new();
    gtk_container_add(GTK_CONTAINER(window), grid);

    // 创建子小部件
    GtkWidget *button1 = gtk_button_new_with_label("Button 1");
    GtkWidget *button2 = gtk_button_new_with_label("Button 2");

    // 设置子小部件位置
    gtk_grid_attach(GTK_GRID(grid), button1, 0, 0, 1, 1);
    gtk_grid_attach(GTK_GRID(grid), button2, 1, 0, 1, 1);

    // 显示子小部件
    gtk_widget_show(button1);
    gtk_widget_show(button2);

    // 显示窗口
    gtk_widget_show(window);

    gtk_main();
    
    return 0;
}