[SOLVED]Excel 2010 Passing form control as parameter fails

Hi everyone!

I have a situation where I am trying to load three combo boxes with the same values. (They are each on separate sheets of a multipage control, where some sheets do not have the combobox.

So, I'm using one procedure to select the comboboxes (LoadTravelerSelectors) and another to load the combobox passed as a parameter (LoadTravelerSelectorBox)

Here's the code:

Sub LoadTravelerSelectorBox(Ctl As Control)

'   Configure the combobox
Dim ThisRow As Long
Dim Result As Long
Dim lx As Long

Ctl.Clear
ThisRow = FirstTraveler
Traveler = TravelerModule.ReadTravelerSpreadsheet(ThisRow, Result)
While Result = 0
      Ctl.AddItem Traveler.Initials
      lx = Ctl.ListCount - 1
      Ctl.List(lx, 1) = Traveler.Name
      Ctl.List(lx, 2) = Traveler.Status
      ThisRow = ThisRow + 1
Wend

If Ctl.ListCount > 1 Then
   Ctl.AddItem Ctl.ListCount
   Ctl.List(lx, offsetTravelerInitials) = "All"
End If

End Sub

Sub LoadTravelerSelectors()

Dim Ctl As Control

'   Load the various combobox traveler selectors

Set Ctl = Me.cboCalendarTravelerSelect
LoadTravelerSelectorBox (Ctl)                           <==  VBA complains when trying to interpret this line
LoadTravelerSelectorBox (Me.cboCalendarTravelerSelect)  <==  or this (slightly different) version

Set Ctl = Me.cboDestinationTravelerSelect
LoadTravelerSelectorBox (Ctl)

Set Ctl = Me.cboTravelTravelerSelect
LoadTravelerSelectorBox (Ctl)

Set Ctl = Me.cboLodgingTravelerSelect
LoadTravelerSelectorBox (Ctl)

Set Ctl = Me.cboExpensesTravelerSelect
LoadTravelerSelectorBox (Ctl)

Set Ctl = Nothing

End Sub

The comboboxes are all configured the same. The routine to get a traveler is tested and works properly.
When I get to the first call to LoadTravelerSelectorBox, VBA hiccups with the message:
Run time error 424: Object required

Seems to me that I'm passing an object (a combobox. and expecting an object (Ctl as Control)

This must be doable (I would suppose), so what else do I need to do?

Thanks in advance for help,

Tony