You need to look at the CommandBars collection and the Controls collection
of each Commandbar object.

When doing this, you need to be very careful that you set the
CustomizationContext property correctly. The CustomizationContext defines in
what document, template or add-in the toolbars and buttons are stored. if
you make any change to a button, the change will be stored in the file
specified as the current CustomizationContext.

This is a notoriously tricky part of Word programming. Proceed with caution
and take regular backups.

Either (or probably both of) the Shapes and the InlineShapes collections.

--
Enjoy,
Tony

Hi Weste,

to the best of my limited knowledge,
controls form the control toolbox are
either shapes or inlineshapes.

So you might have to loop through all shapes
and inlineshapes and check their type.

Inlineshape controls are of type 5 (= wdInlineShapeOLEControlObject).

Here is an example for inlineshapes, in the doc's mainstory.

Sub test400()
Dim iShp As InlineShape
For Each iShp In ActiveDocument.InlineShapes
  If iShp.Type = wdInlineShapeOLEControlObject Then
     If iShp.OLEFormat.ClassType = "Forms.TextBox.1" Then
        MsgBox "Control Textbox"
     End If
     If iShp.OLEFormat.ClassType = "Forms.ComboBox.1" Then
        MsgBox "Control Combobox"
     End If
  End If
Next
End Sub

Note, that the comparison is case sensitive,
so "Forms.Textbox.1" won't work,
whereas "Forms.TextBox.1" does.

With shapes, which have to be converted from
inlineshapes to shapes programmatically beforehand,
things seem to be different, as they are
of type msoOLEControlObject,
which means, they are part of Office, not of Word.

Sub test401()
Dim oShp As Shape
For Each oShp In ActiveDocument.Shapes
  If oShp.Type = msoOLEControlObject Then
     MsgBox oShp.OLEFormat.ClassType
  End If
Next
End Sub

HTH