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If you look back to the partial class diagram of the RadioButton on page 565, you’ll see that the class adds only one property to the ToggleButton from which it descends: GroupName, which is defined as a String. Unlike other types of buttons that operate independently, RadioButtons interact within a group—only one button in the group can be selected at any given time.
There are two ways to create a RadioButton group. You can either nest them in the same container (usually, but not always a GroupBox), or you can explicitly assign the GroupName property to the same value.