[Glade-users] glade_xml_signal_autoconnect and manual connection of signals

I recently landed to the beautiful world of gtk programming and using
Glade as interface designer I learned quite a lot stuffs.

I always connected signals from my application manually, for example
the event of a button that's been pressed:

/* A bunch of data to be set and used in the callbacks */
typedef struct _AppData AppData;
struct _AppData
        GtkAboutDialog *dialog_about;
        GtkLabel *hello_label;

about_button_clicked_show_about_dialog (gpointer data)
        AppData *widgets = (AppData *)data;
        gtk_dialog_run ((GtkDialog *)widgets->dialog_about);
        gtk_label_set_label ((Gtklabel *)widgets->hello_label, "Wow, it
works!"); }

destroy_it_all ()
        printf ("Destroying...\n");

hook_up_callbacks (GladeXML *the_widgets)
        GtkWidget *widget;
        AppData *my_widgets = (AppData *)malloc (sizeof (AppData));
        /*** Loading stuffs into data structure ***/
        my_widgets->dialog_about = (GtkAboutDialog
*)glade_xml_get_widget (the_widgets, "dialog_about"); 
        /*** Hooking generic signals ***/
        widget = glade_xml_get_widget (the_widgets, "window_main");
        /* delete event */
        g_signal_connect (G_OBJECT (widget), "delete_event", G_CALLBACK
(gtk_main_quit), NULL); /* Have the destroy signal quits */
        g_signal_connect (G_OBJECT (widget), "destroy",
(destroy_it_all), NULL);

        /*** Button pressed ***/
        widget = glade_xml_get_widget (the_widgets,
"about_button"); g_signal_connect_swapped (G_OBJECT (widget),
"pressed", G_CALLBACK
(about_button_clicked_show_about_dialog), (gpointer)my_widgets);

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

        gxml = glade_xml_new (GLADE_FILE, NULL, NULL);

        /* Connect all the signals to the appropriate callbacks */
        hook_up_callbacks (gxml);

        /* start the event loop */
        gtk_main ();

        /* Free the memory used by the widgets we're no longer using */
        gtk_widget_destroy (glade_xml_get_widget (gxml, "window_main"));
        return 0;

Well, I tried to make it using the function
glade_xml_signal_autoconnect but I can't figure out how to operate on
other widgets.
Is there any way to access all widgets (such as hello_label) properties
inside object's callback functions?

Can anyone post the same example using the automatic signal connection?

I imagine I didn't catch the most important thing...

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