You know cannot do this with VFPs texbox class. There is an activex in Windows but it don't has an inputmask. There is an maskedit in Windows but it don't has right handled input too.
I made a class that provide right handled input for numeric texboxes with inputmask.
I sent it UTs download section but it didn't published. If anyone want to download it that is its link below:
http://www.fox4um.com/download.php?op=getit&lid=37