Does anyone know how an option group detects which option button was selected and how it updates it's Value accordingly?

I want a form to return Form.OptionGroup.Value when a user selects a button by pressing enter. If I trap the enter in the button's keypress event, the OptionGroup's value has not yet been updated. However, if I try trapping via the InteractiveChange event of the OptionGroup, I miss out when the user presses enter on the first item in the list (because it is selected by default so no change took place).

I could set the initial value of the first button to 0 instead of 1 but I'd prefer to find a way around that if I could.

Any ideas?