TRadioButton
API Manual
TActiveRadioButton is the active control counter part to TRadioButton.
The AutoPostBack property is set to true by default. Thus, when the radio button is clicked a
OnCallback event is raise after OnCheckedChanged event.
The Text and Checked properties can be changed during a callback.
The GroupName property may NOT be changed during callback because the client-side
name attribute is read-only and can not be changed using javascript.