Is there a group box property that tells you which radio button was clicked?

Add a common event handler to all the radio buttons which belong to a group:

\\\
Private m_Group1SelectedRadioButton As RadioButton

Private Sub RadioButtonGroup1_CheckedChanged( _
    ByVal sender As Object, _
    ByVal e As EventArgs _
) Handles _
    RadioButton1.CheckedChanged, _
    RadioButton2.CheckedChanged, _
    RadioButton3.CheckedChanged

    Dim SourceControl As RadioButton = DirectCast(sender, RadioButton)
    If SourceControl.Checked Then
        m_Group1SelectedRadioButton = SourceControl
    End If
End Sub
///

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