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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
Field Binding Dialog (Rich UI Only)
Please visit the Field Binding page.
Radio Button Group Properties
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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)