Note You must drag the field or column from the field list. If you click the field in the field list and then click the form, report, or data access page, the control won't be bound.
When Access creates the first control inside an option group on a form or report, it sets the control's OptionValue property to 1. On a data access page, you must set the Value property of each option button to a number or any text that’s meaningful for the field the group frame is bound to.
Notes
How?