Flash cs5 code location confusion

Question

Whenever I place the following code on the first frame of my movie, it works fine:

var strGlobal:String = "Global"; 
function scopeTest() 
{ 
    trace(strGlobal); // Global 
} 
scopeTest(); 
trace(strGlobal); // Global

But when I remove it and place it in my document class, it errors out: "Call to a possible undefined method scopeTest" "Access to undefined property strGlobal"

I am new to actionscript 3 and was wondering what to change to make this simple example work from my main document class.

Answer 1

In the same directory as your .fla file create a file named ScopeTest.as and define the following class:

package  {
    import flash.display.MovieClip;
    public class ScopeTest extends MovieClip  {
        var strGlobal:String = "Global"; 
        public function ScopeTest() {
            trace(strGlobal); // Global 
        }
    }
}

Then inside your .fla project (document class):

Then when you run it you should get "Global" traced out to confirm it works.