When you run one form from another, in Init() of child form you may access the properties and methods of the parent form directly without passing the parameters - i.e

thisform.someProperty =_screen.activeform.myProperty
or
thisform.someControl.Value =_screen.activeform.someControl.Value

This is based on the fact that when the child form is in its .Init() it is not an activeform yet, because its .Activate() didn't fire so far, so the calling form still stays active at this time.

Nick