To determine which Radio Button Set is selected, make an event-to-script connection from the selectedItemChanged event of the Radio Button Set part to a script.
For example, the following code fragment sets the proper sampling rate record setting for a music recorder based on the Radio Button Set in the Sampling Rate group:
(self subpartNamed: #musicPlayer) setSamplingRate: (#(8 11 22 44) atIndex: selectionIndex)
Note: | The indexing of the Radio Button Set is 1-based, not zero based. |