I think the main issue is the labelRadioGroup1.Selected.label
However you can use:
Switch( RadioGroup1.Selected.Value, 3, Navigate( Screen3, ScreenTransition.Fade ), 2,
Navigate( Screen2, ScreenTransition.Fade ),
4, Navigate( Screen4, ScreenTransition.Fade ) )
or
Switch( RadioGroup1.Selected.Value, "3", Navigate( Screen3, ScreenTransition.Fade ), "2", Navigate( Screen2, ScreenTransition.Fade ),
"4", Navigate( Screen4, ScreenTransition.Fade ) )
If the above does not work, show the items property of the Radio control
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