I have been trying to implement Win32's MessageBox using GTK. The app using SDL/OpenGL, so this isn't a GTK app. 
I handle the initialisation (gtk_init) sort of stuff inside the MessageBox function as follows:
int MessageBox(HWND hwnd, const char* text, const char* caption, UINT type){    GtkWidget *window = NULL;    GtkWidget *dialog = NULL;    gtk_init(>kArgc, >kArgv);    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);    g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(delete_event), NULL);    g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL);    // gcallback calls gtk_main_quit()    gtk_init_add((GtkFunction)gcallback, NULL);    if (type & MB_YESNO) {        dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO, text);    } else {        dialog = gtk_message_dialog_new(GTK_WINDOW(window), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_INFO, GTK_BUTTONS_OK, text);    }    gtk_window_set_title(GTK_WINDOW(dialog), caption);    gint result = gtk_dialog_run(GTK_DIALOG(dialog));    gtk_main();    gtk_widget_destroy(dialog);    if (type & MB_YESNO) {        switch (result) {        default:        case GTK_RESPONSE_DELETE_EVENT:        case GTK_RESPONSE_NO:            return IDNO;            break;        case GTK_RESPONSE_YES:            return IDYES;            break;        }    }    return IDOK;} 
Now, I am by no means an experienced GTK programmer, and I realise that I'm probably doing something(s) horribly wrong.
However, my problem is that the last dialog popped up with this function stays around until the process exits. Any ideas?