how to loop threw all combo boxes on a page

I have 13 combo boxes that the selected item is decided based on the result of a sql query.
I want to check all of the combo boxes for a value of "Not Done" and then set the background color to a different color.
I have named the combo boxes cmb1, cmb2, cmb2 and so on... I thought I could do something like this.. but I was wrong

For i As Integer = 1 To 13
            If cmb(i).....  then
                 do stuff

            End If

I think I might be way off here on how to pull this off.. any help would be great


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