I ran into a similar problem and got over it by calling the form with a name then accessing the name.

Ex. DO FORM test NAME X
You can then get to the form object or anythng it contains by referencing X.
? x.name
x.caption = "This is a test"
x.txtName.Value = "Ken"

I usually name all of my forms the actual name of the form. I cuts down on confusion. This also works for referencing one forms objects from another form.