eeesh, I know a little AS3 but not the programming. Here are two thoughts though.
One, the stupid question, have you tried doing it exactly the same way you do it in AS2? I know that 3 is a lot more advanced, but I wouldn't think adding a checkbox would be that radically changed that all of a sudden you can't add a simple checkbox.
If it has... is there any reason you need AS3? You always have the option, even in Flash CS3, to open the movie options and reset it as AS version 2.
hope that helps
-------------------------
Whatever you can do or dream you can, begin it. Boldness has genius, power and magic in it. Begin it now.
-Johann von Goethe
When Two Hearts Race... Both Win.
-Dove Chocolate Wrapper
Chroniclemaster1, Founder of
www.EarthChronicle.com
A Growing History of our Planet, by our Planet, for our Planet.