"Class" for Exporting for ActionScript not accessible

Question

I am trying to export some audio files with Sound Properties > Export for ActionScript. However, for some reason the "Class" box is greyed out and unaccessible. I've tried out a number of different files: .mp3, .wav,  .aif, but Class is still greyed out.
What is the problem? Is there some sort of workaround?

Answer 1

I just found out that the reason the reason why it was not editable is because the document has been set up for Actionscript 1.0 and 2.0, not 3.0. I tried to follow this video: http://www.youtube.com/watch?v=r5Ai4-j0bUc on how to export sound to actionscript.
I've been trying to find the Actionscript 1.0/2.0 version of that workflow to set up a sound, volume, play, frame range, play increment, etc. Is it essentially the same coding?
import flash.media.SoundTransform
import flash.media.SoundMixer
SoundMixer.stopAll()
// The section below imports the sound you just "Exported for Actionscript"
// Replace "sound" with the "Class" name you put in the ActionScript tab for the audio clip
// ** If there is more than one sound, then copy & paste the line below and rename the "sound1" and "sound" to each new audio.
// ** Do the same process with the ".play" line at the bottom of the program
var sound1 = new sound();
// Section below controls the audio volume. Range is between 0-1.
// Example:  .5 >>>> 50% volume
var myvolume:SoundTransform = new SoundTransform(.5);
// Below controls the
// (<starting frame within audio track>, <frame increment or how fast the track plays>,<Connects to Volume - ignore it>)
sound1.play(0, 1, myvolume);