Thank for your prompt response. Performance evaluations are a common theme in this area. :-) Mine is too. I studied the first form extensively. Much of my code is modeled on it. Interestingly I am not able to duplicate the behavior on that form. That indicates to me that my answer is there somewhere. It may be a difference between executing the option buttons On Entry vs On Exit. I'll study the differences in the code and try a few variations and see where it leads...