> Secondly, how do I obtain a pointer to the dialog's 'Cancel' button so that I 
> can connect a signal handler to it?  I looked for functions like 
> gtk_dialog_get_child() or gtk_window_get_child_with_id() or something similar 
> but I couldn't find anything.

You could add the cancel button after creating the dialog with
gtk-dialog-add-button:

http://developer.gnome.org/gtk/stable/GtkDialog.html#gtk-dialog-add-button

-- 
Emmanuel Thomas-Maurin <manutm...@gmail.com>
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