See if the following Microsoft TechNet article helps:
http://www.microsoft.com/technet/prodtechnol/office/office2000/proddocs/opg/part2/ch06.mspx
Check the section "Working with Images on Command Bar Buttons".
<sigh> Well, that was an interesting read <g>. It didn't tell me
about A2K, though or for doing this but not for a commandbar. I now
do floating toolbars in XL2K all the time, so have the code for
working with FACEID images for that app so know what it's like and
it's very easy with the right code.
However, I need to see how to add FACEID images programmatically onto
A2K buttons in a solution and not to a toolbar. I copied a FACEID
over the weekend and converted to bitmap which I then embedded to a
button (which isn't my preference as adds size to solution, etc.), but
it seemed to do the job. But when I took to office yesterday, saw
that the grey of my scheme there must be slightly different as here as
icon showed ugly colour differentiation.
Oh well, will continue looking again in the archives to see if it can
be done and if there is actual code anywhere there to help with this.
There must be a way. I'm just not asking the right question in the
archives search, perhaps.
Thanks.

D