var oNewInstance = Subform1.DisclosureQuestions.instanceManager.addInstance(1);
some times just xfa.form.recalculate(1); will do it for you...try them individually and together to see which one works best. Remember any time you use relayout() that should be the last exicuting line of code in that script.
Thanks for the suggestions. I tried it with relayout, recalculate and with both and it still doesn't work.