>>Does someone know the correct syntax for keypress event if I want to have only a set of characters allowed, say
>>for example (1,2,a,b,*,#) in a textbox?
>>
>>Something like:
>>if inlist(chr(nkeycode),'1','2',etc)
>>
>>or !inlist() is better?
>>what is the best way to do this?
>
>look in the format and inputmask help. there's a way there to limit the keys a user can enter into a field. it dates back to fox1 i think. it also allows the user to press the spacebar to step through the options.
>
>lots of help, eh? at least you'll recognize it when you see it.

Couldn't find anything general in those props, but once I stopped being lazy and tried the Keypress a little, it works like a charm.

if between(chr(nkeycode),'0','9') or inlist(chr(nkeycode),'a','b',etc)
  && do nothing
else
  nodefault
  && message if needed
endif

for example allows only those listed chars entry.