GTK+ 질문 드립니다.

int main (int argc, char *argv[])
{ 
    // GtkWidget은 widget들을 위한 기억장소 타입이다.
    GtkWidget   *window;
    GtkWidget   *vbox, *hbox;
    GtkWidget   *scrolled_window, *clist;
    GtkWidget   *button_add, *button_clear, *button_hide_show;    
    gchar		*titles[2] = { "Ingredients", "Amount" };
 
    gtk_init(&argc, &argv);
 
    window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_widget_set_usize(GTK_WIDGET(window), 300, 150);
 
    gtk_window_set_title(GTK_WINDOW(window), "Vullenerbility Intellignt Robot");
    gtk_signal_connect(GTK_OBJECT(window),
                       "destroy",
                       GTK_SIGNAL_FUNC(destroy),
                       NULL);
 
	gtk_widget_show(window);
    gtk_main();
 
    return(0);
}