>Is it possible to, using the format property to limit the input into a textbox? For instance Only three letters - a Y for Yes, an N for No, and an M for Maybe - and have it not lose focus if one of those are not entered. I know how to do it in the Valid method, but was wondering if there was some magic to use in the Format property, or something
>
>Thanks.

off topic (a little bit)

There is a widly unknown problem with input (on any element). This is [CTRL]+0 (zero). Whatever you do with FORMAT, this is a valid entry, - NULL-. So this sets the value of the object to NULL if your controlsource can not deal with it you have a nice little error

do not forget to add to base classes KeyPress event something like

LPARAMETERS;
 tnKeyCode,;
 tnShiftAltCtrl

IF  tnShiftAltCtrl=2 AND tnKeyCode=48 THEN
  NODEFAULT
ENDIF

Lutz

Update:

M for Maybe is NULL, because NULL is in boolean the I don't know. This is the way all subsequent boolean logic works.