>Thanks but I am still not sure what to do.
>
>I am not calling the form from the Main Prg., the Main program calls a program called openfile which calls the formset with Do Form Myform.

You're correct that you can't use Thisformset in menu/popup procedure. Therefore, as Bruce told you, you must create reference to the formset, i.e. when you start it use NAME clause of Do Form command, e.g.
Do Form myformset NAME oApp.myformset LINKED

oApp.myformset is property of your application object. If you don't have one you may use PUBLIC variable:
Do Form .... NAME oMypublicvar LINKED

Now, you may call any PEM of your formset, as
oApp.myformset.myPropertyEventMethod