Sub ShowCalendar(ByRef txtDate As TextBox)
Dim frmCal As Form ' calendar form
Dim ctlD As Control ' date control on this form
Set ctlD = txtDate
DoCmd.OpenForm "popCalendar", , , , , acHidden
Set frmCal = Forms("popCalendar")
With frmCal
Set .DateControl = ctlD
.InitialDate = ctlD.Value
.Visible = True
End With
End Sub