guile-gtk -> guile-gnome conversion

Is there a guile-gtk -> guile-gnome conversion guide? (I am a bit lost 
and have quite a bit to convert).  What should I read?

OK, The first question I have is:

    What is the guile-gnome equivalent of guile-gtk's (gdk-event-keyval 
event)?

or in other works (so I believe)

    How do I get the keyval from an key press event?

I suspect the answer is trivial because I can't find it :)

Cheers,

Paul.