You get the form name
cformname=WONTOP()
or
cformname=_SCREEN.ACTIVEFORM.NAME()

Then you can reference it as:
&cformname..property()
i.e.( myform.mymethod() or myform.myproperty() )

In the object oriented fashion...
as it is a nobject.

Often I have had to make the forms name a public variable.
and have done it like.
PUBLIC myform &&IN the start program

IF WONTOP()='MYFORM'
Myform.mymethod()
Myform.myproperty=.t.

ENDIF