>Alan,
>
>In those it doesn't, does the cursor remain in the textbox? If so, is there any code in the valid method?

Yes, the cursor just jumps to the first position in the textbox just as if you hit the HOME key. Some of the textboxes have something in the valid and some don't. Even if I add a new textbox with all methods and properties at the defaults, the problem still exists so it must be something at the form level.