Edward,
A ComboBox can not display a calendar control, only record values from the underlying
table, query, or valuelist.
You can simulate the "action" of a combo by making the height of the calendar toggle up
and down.
Place a small button control on your form, and give it a picture value of a small down
arrow graphic.
Size the height of your calendar control to approx the size of a combo box height, with
the arrow button placed beside it.
In the OnClick event of that button... using example names and value...
If YourCalControl.Height = 400 Then
YourCalControl.Height = 2000
Else
YourCalControl.Height = 400
End if