Change buttons on toolbar dynamically

I've seen several similiar posts - but none answered.

Is it possible to dynamically change the buttons on my custom
toolbar?

I'm using a toolbar that has 5 image buttons (no text labels) to
represent the most common user actions. I need to manipulate some of
the images/icons displayed on each button to communicate various
statuses to the user.

Since I have more than one button that will also be a status
indicator, I'd like to avoid the obvious hack of building and storing
multiple toolbar images and displaying the appropriate one.

My program is for the Pocket PC and is being developed with C++
VS2005.

Many thanks to anyone who has any suggestions.
.