>>>Why don't you make a class derived from textbox, add a property, in When method save old value to the property, in Valid... etc.?
>>
>>Good idea. This is probably what I'll do. Thanks.
>>
>>Any more suggestions from anyone else?
>
>You are going to have to store it somewhere. If not a property, a memvar?

You're right also. As I said to Paul, I'll modify each of my class controls to be able to handle that change. Thanks.