A client wants an Optiongroup with Yes and No as choices for a logical field (bit datatype in SQL.) It seemed a reasonable request but now I'm not so sure that it's even possible. If so, what's the trick?

The Optiongroup itself doesn't accept logical data but the Optionbuttons do. If you can't specify the field as the controlsource for the Optiongroup, how are the buttons supposed refresh properly and update the field. This must be incredibly simple but it eludes me at the moment.