WebRadioGroup.SelectedCaption
From Xojo Documentation
Method
Returns the caption (as a String) of the selected radio button.
Example
The following code in the SelectionChanged event tests which radio button was clicked:
Select Case Me.SelectedCaption
Case "First"
MsgBox("button 0")
Case "Second"
MsgBox("button 1")
End Select
Case "First"
MsgBox("button 0")
Case "Second"
MsgBox("button 1")
End Select