The radio button is used to allow users to make a selection from a group of choices.
You can find a walkthrough on using Radio Buttons for Rich Display Development linked here: Using Radio Buttons
Please visit the Field Binding page.
radio button group property -This allows you associate multiple radio buttons together by specifying a field name for the program to receive the value. This property must be bound to a field in the RPG program (Rich UI Only).
related field property - This property allows you to create a radio button group by associating the radio buttons with a field from your original application. In order to do this the id of the field must be associated with the button group. (Genie Only)