I guess I might be able to use that approach, Ron ... but I'd hate to have to
use a macro that clears the undo History when running a built-in function
just to have a preferable Icon image.

I was afraid there wasn't going to be a way to do this ... I could
understand why MS might want to restrict users from changing the images on
built-in functions (given the ways they have locked down certain parts of the
UI), but it doesn't make sense that they prevent users from adding their own
custom images to functions where they don't provide a button image.

Thanks for looking at this.