Can't figure this one out.  Can anyone show me some VB code to accomplish this?

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Got it!  For anyone else that needs it.  Just had to take a while to dig deeper into Infragistics documentation.

   ' Find all Network PC printers installed.

            Dim pkInstalledPrinters As String 

            Dim PrinterSelect As ComboBoxTool = Me.UltraToolbarsManager1.Ribbon.QuickAccessToolbar.Tools.Item("this will be the key field of  

                 your QAT tool")
           
            For Each pkInstalledPrinters In PrinterSettings.InstalledPrinters
                PrinterSelect.ValueList.ValueListItems.Add(pkInstalledPrinters)
            Next pkInstalledPrinters

            ' Set the combo to the first printer in the list
            PrinterSelect.SelectedIndex = 0