Radio Button Group-validate that a radio button is selected

Hi,

I am using Designer ES4 and have not been able to figure out a script to assure that in each of 15 radio button groups (each an exclusion group) that the user has selected one of the 7 radio buttons before a formcalc calculation (sum) is done.

I've tried to add formcalc script to the calculate event which has the formcalc sum for each group: if buttongrp1.rawValue == 0 or 1, or 2...6, then sum, else show text box ("please complete"). Haven't been able to get this to work.

(I don't think I can mix formcalc and javascript in the same calculate event?)

Any suggestions or sample script would be appreciated.

Much thanks.