gnome dialog/libglade problem

[Edgar Denny]

Hi All,

I'm have problems understanding how to get the gnome about dialog
working properly with libglade.  If I have the following:

    static GladeXML *xml;

    void
    on_about_activate( GtkMenuItem *menuitem,
                       gpointer     user_data)
    {
        GtkWidget *about_dlg = glade_xml_get_widget( xml, "about");

        gtk_widget_show( about_dlg);
    }

The first time I call on_about_activate( ...), then the about dialog
comes up as expected.  When I click the OK button on the dialog,
it also disappears ( I don't define this callback since the GGAD
tells me that there is a default callback to this click which closes
the dialog). However, if I then try to call 
on_about_activate( ...) a second time, the dialog fails to appear,
and I get the following message:

    Gtk-CRITICAL **: file gtkwidget.c: line 1425 (gtk_widget_show):
    assertion `GTK_IS_WIDGET (widget)' failed.


If I replace the callback above with the following, then I don't
get the error message, the program simply crashes (with a segmentation
fault).

    void
    on_about_activate( GtkMenuItem *menuitem,
                       gpointer     user_data)
    {
        static GtkWidget *about_dlg = NULL;

        if( about_dlg != NULL)
        {
            gdk_window_show( about_dlg->window);
            gdk_window_raise( about_dlg->window);
            return;
        }

        about_dlg = glade_xml_get_widget( xml, "about");

        gtk_widget_show( about_dlg);
    }

Can somebody please enlighten me as to what going on, and what I'm
doing wrong.

Thanks,

Edgar.

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