Updating a subform after data entry

[Presto]

I have a Main form with a subform named Payments.
I have a button on the main form named NewPaymentEntry that opens a small
popup form to enter a new payment.
There is a "Save" , "Cancel", and "Close" button.

When I click "Close" I want it to automatically refresh the Payments subform
so I can see the new payment. How can I make this happen. (the interesting
thing is - it used to do this automatically before... but not any more....)

Here's the current "Close" code onclick event:
--------------------------------------------------------
Private Sub cmdClose_Click()
On Error GoTo Err_cmdClose_Click
DoCmd.Close
Exit_cmdClose_Click:
Exit Sub

Err_cmdClose_Click:
MsgBox Err.Description
Resume Exit_cmdClose_Click

End Sub
-----------------------------------------------------------

Any help for this VBA newbie would be greatly appreciated. :)
<3 Presto