>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

If it was just Y or N you could use Y as the .InputMask. If you need the extra choice of "M" then you could set the .InputMask to A and then check for valid values - but that's probably not much different from what you're doing now in the .Valid event.