Recalculate total cost in Access automatically as a new entry is added

I have created a product order form which also shows the total of the order items. I am wanting the total to recalculate as a new order is added to the sub form showing the product order details but can't figure out how to do this without the use of a button click event.
Any suggestions?
Yukie HamasakiAsked:
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PatHartmanCommented:
You would use the AfterUpdate event of the subform.  Either use a DAO loop to sum the subform's recordset clone or use DSum() with a where clause.

Me.Parent.txtOrderSum = DSum("Amount", "tblSubformRecords", "OrderID = " & Me.OrderID)

Doing this is bad practice since you should not save calculated values.  However, if the txtOrderSum on the parent. form is unbound, that's fine.
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PatHartmanCommented:
answer provided
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