How to set the value of a textbox to 0 "Zero" in a continues form footer while the detail of the form has not data

I have a continues form in which I used the” if(), IsNumeric(), isnull and SUM ()” functions to calculate the total amount of the records if exist in the details, else return me 0 “Zero”:
Iif(IsNumeric(Tr_Amount), SUM(Tr_Amount),0)
Iif(isnull(Tr_Amount), sum(Tr_Amount),0)
However, it’s not working fine. While it has no records in in details it doesn’t return 0 in the textbox, but if it has some records it returns the total amount.
Please help!
Thank you in advance! 

 if this involves the case of a continuous form where there are no records - and the field sits in the footer of the continuous form....
you can put in code in the OnCurrent event of the form that checks for records and if no records then writes the 0 into the text field in the footer.  note that with this approach all the logic is here in the OnCurrent event as that field
must be unbound with no formula in its control source - - meaning that when it sums, that sum code must also occur in the oncurrent
the check for records can be a dcount of the record source
since NZ isn't working maybe there is out there another method for this situation that can be put into the field's control as you have been attempting - maybe another responder will educate us both on that....something along the lines of a HasData for forms....but
I don't know what that is off hand and so only suggest this method as a work around.... it should work fine.....

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