>>>>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.

OK, I know this might be a late response, but you can use the tab
property of controls for that. AFAIK this property have no
specific purpose, so can be used in cases like this.
Anyway having an aditional property for holding that value
is perhaps a more *decent* solution.

J. Luis