Right direction is right!

Great!

Thanks for the reply - that is exactly what I wanted and did not know how
to
do.
- I'll try it out right now.

I was trying to find ways to do this. I found out that each buttonface
can
has a picture and a mask property, both if which need to be supplied - and
I
did not want to distribute 16 image files with my add-in.

<snip

I don't think 16 small image files overall would make a larger file size
than attaching same on a toolbar. As regards applying the picture and the
mask you might be interested to read KeepITCool's technique in this thread.

http://tinyurl.com/7d2fu

Regards,
Peter T