...

Yes, I had only made the change in the InteractiveChange() method. But I expected that method to generate the error message. Instead, somehow, when I started typing, InteractiveChange() ran to the point where I set the control's Value to a string, executed that line, and then, instead of generating the error message, execution somehow jumped to the

                                     ^^^^^^^
 The ProgrammaticChange event "[O]ccurs when the value of a 

control is changed in code." You just changed the value of the control, so the event fired.

Ah.... Of course. Brain flatulence.

Having changed the code in both methods, my error handler works, so I'm satisfied.

Issue One remains--but may never be solved.

Thanks.

Ken Dibble www.stic-cil.org