I've tried using a masked edit box for data that should be numbers only. I set the mask type to standard and the mask to "##########", which is supposed to allow optional numbers up to 10 characters. What happens is that I can't tab out of the field unless I've entered 10 numbers, which is not what I want. I want up to 10 digits. I can't find documentation for the numeric masks, only for standard and date time. I don't know if using a numeric mask would do the job.