ActionScript 3.0 :: ADDED_TO_STAGE On Frame 1 Of MovieClip Symbol?

I made the following discovery while attempting to use the ADDED_TO_STAGE event with timeline code. I don't know whether to say it's a real problem, or maybe it's just an observation, but it's very simple to demonstrate. Just make a MovieClip symbol in the library, and set it for export. On frame 1 of this MovieClip symbol, enter this code:

ActionScript Code:
import flash.events.Event;
addEventListener(Event.ADDED_TO_STAGE, added);[code]....

(Note: I called my MovieClip symbol Screen1, and gave it a class name of Screen1 when I set it for export. But I am letting Flash create the class for me, there is no same-named class in the classpath)Next, put this code on frame 1 of the main timeline:

ActionScript Code:
var screen1:Screen1 = new Screen1();
addChild(screen1);

Looking at that latter code, apparently when the screen1 instance is created in line 1, the object hasn't fully finished instantiating before line 2 is executed,because the trace message never happens.Prior to this, I had assumed that code on frame 1 of a MovieClip, if it were "base level" and not inside any functions, was roughly equivalent to the constructor of a class. Apparently that isn't so, because whenever I add an event listener for ADDED_TO_STAGE in the constructor of a class, it always works, even if the object is immediately added to the display list, exactly as above.

In some of my other testing, if the movie clip instance is later removed from the stage and added again, the added and removed handlers fire just fine. It's only this initial time that it gets skipped. Also, if you add an event listener for ADDED_TO_STAGE from the main timeline instead, like this:

ActionScript Code:
screen1.addEventListener(Event.ADDED_TO_STAGE, added);

It works just fine.The conclusion I draw from all this is that there is no way to use the ADDED_TO_STAGE handler inside a MovieClip's frame code and have it fire the first time. Also that there may be no real equivalent to a constructor when you let Flash create the class for you. Thoughts, anyone? I am attaching a FLA file (CS4 format) in case anyone might want to examine this without putting a file together yourself. Don't expect anything at all fancy, though, it's nothing more than what I described above, and I fully expect you'll want to delete it later.