Iain,

With InteractiveChange what user sees is what he/she gets. With Valid text doesn't look like it should be until user leaves a textbox. As a user I wouldn't like it.

>Sergey,
>
>your suggestion was to use interactivechange, which means after each button pressed do the following, if it is as simple as a proper case why bother with interactive change?. Why not do it when leaving the object unless other things need checking