Spawning and hiding pages

Hi,

I'm working on creating a form in Acrobat where the user (who will be using Reader) will select from a group of 5 radio buttons. 3 of these choices/radio buttons need to spawn and go to a page where they provide more detail. I've figured out how to use templates and spawning to have a template page hidden until the user clicks on one of the radio buttons and then go to that page (last page) using this code on each of the 3 radio buttons:

this.spawnPageFromTemplate("Driving.HighwayCode");
this.pageNum = this.numPages - 1;

The issue I have is that I only want the template page to be able to spawn once and then ideally hidden if one of the other 2 radio buttons are clicked. I've tried to create some code that when one of the spawning radio buttons is selected, a hidden checkbox changes to say the page has spawned and that if another of the buttons is selected then not to spawn along these lines: https://answers.acrobatusers.com/Limit-spawned-template-q231635.aspx but I've not managed to crack it.

Any help or advice gratefully received.