>Frank,
>
>I don't think you can mask the Web controls in the way that you want. You might be able to do it with AJAX. Check out - http://www.asp.net/ajaxlibrary/act.ashx and the MaskedEdit extender.
>

Hmm... will that be able to work on top of the mmTextBox? I don't want to lose the binding that these control give me.

< later >

had a look at the tutorials and they say this: "MaskedEdit is an ASP.NET AJAX extender that attaches to a TextBox control..." so I guess that means it should not break my stuff. Thanks!