Content Controls - Usable form using Radio Buttons

[Cheesecube]

If you map the CCs by Tag e.g., A1, A2, A3 ... B1, B2, B3 ... etc. Then you can title them anyway you want.

Private Sub Document_ContentControlBeforeStoreUpdate(ByVal ContentControl As ContentControl, Content As String)
Dim oXMLPart As CustomXMLPart
Dim oNode As CustomXMLNode
  Set oXMLPart = ContentControl.XMLMapping.CustomXMLPart
  If Content = True Then
    For Each oNode In oXMLPart.DocumentElement.ChildNodes
      'The first character of the title and node name identifies the set (i.e., "A" or "B")
      If Left(oNode.BaseName, 1) = Left(ContentControl.Title, 1) Then
        If Not oNode.BaseName = ContentControl.Title Then
          oNode.Text = "false"
        End If
      End If
    Next
  End If
lbl_Exit:
  Exit Sub
End Sub

Hi, kindly walk through this code... I see that the code refers to the first letter of Title to match and group together the checkboxes.

Which part of the code uses the content control Tags to achieve the grouping functionality?