Don't need to export a symbol at all. Try:
Code:
this.createEmptyMovieClip("fader", 1000);
fader.beginFill(0xFFFFFF, 100);
fader.lineTo(Stage.width, 0);
fader.lineTo(Stage.width, Stage.height);
fader.lineTo(0, Stage.height);
fader.endFill();
fader.onEnterFrame = function() {
this._alpha -= 2;
if (this._alpha <= 0) this.removeMovieClip();
};
* Note that the Stage properties might be erroneous in the testing environment, but will work when published*