Use the AfterUpdate of the control (if it's a stand-alone control), or of
the option group (if it's part of an option group) to SetValue (in a macro)
or assign the value (in code.)
Not sure if it's really a good idea though. Considerations such as:
- You can quite easily read the value from the form.
- Doesn't work in versions of Access before 2007.
- If it's a bound form, the tempvar would not be up to date when you move to
a different record.