[AccessD] Lost Focus. Not?

Dear List:
 
When the following code is run:
 
Private Sub cboManufacturers_LostFocus()
    Me.cboManufacturers.Visible = False
End Sub

I get an error that says "You can't hide a control that has the focus."
Doesn't seem to make sense.  What am I missing here?
 
TIA,
 
Rocky