question on menubar implementation

Hi, there.
Didn't get many replies *g* to my last post
( http://list-archive.xemacs.org/xemacs-design/200412/msg00062.html ), so=
 I'll post the question separately, maybe it won't be filtered out on sub=
j=3D.*BeOS.* :p

The menubar implementations I have seen so far all seem to construct menu=
 trees on the fly (=3D submenus are created when an item is selected).
It would be simpler for me if I could generate all the menu at once, and =
update it in case it changes. Is this at all possible ?

Fran=E7ois.