Class, urlloader and as3

Hello.

Im trying to get the grasp of classes and as3 and i got probably an easy question for someone with good as3 knowledge.

Lets say i got a main.as and a class URLLoad.as that loads some external vars. In the URLLoad class i got a event.complete listener. So i know when the vars are finnished loading and everything works fine. But how do i know it has finnished loading the vars if i try to reach them from main.as file??? Whats the routine for doing this? Is it better to remove the event.complete listener to main.as file?

Thanks for any help.
Jarod