Many thanks for the prompt reply, the issue is I have several radio buttons and the reason I want to validate if any has been checked is to ensure the calculate button will not display any value unless all required radio buttons has been selected.
for example:
Age: <10, 11-50, >51
Gender: M, F
Color: Red, Green, Blue.
is there an easier way?
p.s. when I checked ‘required’ under radio button, it doesn’t change anything, it will still automatically calculate.