How can I dynamically populate a combo box list based on a previous list box choice using Word 2007 Content Controls

I'm designing a tabular form in Word 2007 to be used across my firm's IT deptartment for Change Management. I'd like to use a content control list box to display a list of systems (i.e. 'Front End', 'Back End', 'Database', 'Infrastructure', 'Batch', etc.). Selecting a member of this list would cause a list of names to be available in a combo box of Resources. The user would then select one member of this resource list. A different list of resources would be available for selection based on the selection made in the Systems list box. For now, at least, resource lists would be maintained in document source code.

I've developed several Excel applications using VBA, but have never ventured into Word. I'm trying to determine if I can use these nice-looking content controls to accomplish my task, or should just stick with VBA controls.

Have looked around extensively for materials that discuss how to code for these content controls, without any luck. In addition to advice on my question, would also greatly appreciate any feedback on resource material on coding for these content controls - books, tutorials, etc.
DBuzzellAsked:
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GrahamSkanConnect With a Mentor RetiredCommented:
You need some code like this. It goes in the ThisDocument module of the document.

Note that it uses the Tag property to distinguish between controls, sot that needs to be set for both.
Private Sub Document_ContentControlOnExit(ByVal ContentControl As ContentControl, Cancel As Boolean)
Dim cc2 As ContentControl
    If ContentControl.Tag = "First" Then
        For Each cc2 In ActiveDocument.ContentControls
            If cc2.Tag = "Second" Then
                cc2.DropdownListEntries.Clear
                Select Case ContentControl.Range.Text
                    Case "Red"
                        cc2.DropdownListEntries.Add "Scarlet"
                        cc2.DropdownListEntries.Add "Vermillion"
                    Case "Blue"
                        cc2.DropdownListEntries.Add "Navy"
                        cc2.DropdownListEntries.Add "Azure"
                End Select
            End If
        Next cc2
   End If
End Sub

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DBuzzellAuthor Commented:
The solution provided the foundation for me to code a complete solution
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