Custom GtkWidget subclasses using GtkBuilder

[Xavier Claessens <xclaesse gmail com>]

Hello,

I'm considering moving to gtk builder, but my problem is the same AFAIK:

I have some GtkDialog defined in a glade file, I would like the class to
be my own EmpathyFoo which inhering from GtkDialog. I don't know how
that could be done with glade/builder.

I described the problem there:
 http://live.gnome.org/Empathy/Roadmap/GtkWidgetify

Any idea about a better way to do that?

Thanks,
Xavier Claessens.