Auto fill a textfield in subform

Ok, so I have this table on page 1 of a form.

I have a subform called Enrollment on page 4 of said form.

I add another instance of Enrollment for every row filled in on the table on page 1.

i.e. John Brown     Grade 4     Male

Jane Brown          Grade 5     Female

The student's name gets populated in the instance of Enrollment that is visible because there is always one student.

However, when I use scripting to create another instance of Enrollment, I can't get the student's names to populate(auto-fill) the names on the new instance of the subform Enrollment.

I have tried all this...

Enrollment.firstname[1].rawValue = first2.rawValue;

      Enrollment[1].middlename.rawValue = middle2.rawValue;

        oSubForm.lastname.rawValue = last2.rawValue;

oSubForm is calculated by...

var nIndex = 1;

var sSOM = "Enrollment[" + nIndex + "]";

var oSubform = xfa.resolveNode(sSOM);

I even tried xfa.resolveNode("Enrollment[1].lastname").rawValue

NOTHING is filling in the second subform fields. How do I get to them?

I can't see what they would be called because the instance of the form is generated on the fly by the dropdown!

Enrollment.instanceManager.addInstance(true);

I have searched and searched, but there is no definitive way I have seen to call these new fields.

Anyone?