[mso] Access 2002: Calculating On Sub Form

Have a subform where user enters line items, quantity and unit price, this
detail is tied to a purchase order.  Need to get a 'refreshed total' on my
main purchase order form if user adds/changes quantity or unit price in
subform.  I had the form at one time tied to a table, then had a 'refresh'
button on the main form with the following row source:

SELECT DISTINCT Sum(([UnitPrice]*[QTY])) AS TotalPrice FROM SitePODetail
WHERE (((SitePODetail.PackageNumber) Like [forms]![SitePO]![FullNumber]));

And the following code on GotFocus of 'refresh' button:

Private Sub Commit_GotFocus()
    DoCmd.DoMenuItem acFormBar, acRecordsMenu, 5, , acMenuVer70

End Sub

This refresh code worked if the user double clicked the 'refresh' button.
Now I have changed the form, it is no longer tied to a data source, I now
have it tied to a couple of combo boxes that bring in specific data to
unbound text boxes, depending on combo box choice.  This change caused my
'refresh' button to stop working, and am getting an error telling me
refresh command isn't available now.  If I change quantities/pricing and go
to design view, then back to form view, it refreshes, but how can I
accomplish this for users so they can see the changes as they edit?  Tried
to put a 'total' on the subform, but no luck there, either.  Appreciate any
advice, I may be looking at this whole thing wrong.  Thank you, Cathy




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