Visibility of content controls

[New@VB]

I have a Word document (aaa.docm) that contains two content controls. The first is a drop-down list content control (Title: CCDDL) with the selections "No issues" and "Issues found". The second is a text box content control (Title: CCTB) to be used to describe the "Issue". I would like the Content Control Text Box to disappear if "No issues" is selected from the drop-down list.  When I use the below VB code, the Content Control Text Box will disappear if I select "No Issue" but it will not reappear if I select "Issues found".  What am i doing wrong?

Sub UpdateTextBoxVisibility()
    Dim ddValue As String
    ddValue = ActiveDocument.SelectContentControlsByTitle("CDDL")(1).DropdownListEntries(1).Value
    If ddValue = "No issues" Then
        ActiveDocument.SelectContentControlsByTitle("CCTB")(1).Range.Font.Hidden = True
    Else
        ActiveDocument.SelectContentControlsByTitle("CCTB")(1).Range.Font.Hidden = False
    End If
End Sub

Thanks for your help!