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Посмотрите, как реализован прелоадер при создании проекта с прелоадером в FD.

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package {
	import flash.display.Sprite;
	import flash.events.Event;
 
	[Frame(factoryClass="Preloader")]
	public class Main extends Sprite {
 
		public function Main():void {
			if (stage) init();
			else addEventListener(Event.ADDED_TO_STAGE, init);
		}
 
		private function init(e:Event = null):void {
			removeEventListener(Event.ADDED_TO_STAGE, init);
			// entry point
		}
	}
}

package {
	import flash.display.DisplayObject;
	import flash.display.MovieClip;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.events.Event;
	import flash.events.IOErrorEvent;
	import flash.events.ProgressEvent;
	import flash.utils.getDefinitionByName;
 
	public class Preloader extends MovieClip {
 
		public function Preloader() {
			if (stage) {
				stage.scaleMode = StageScaleMode.NO_SCALE;
				stage.align = StageAlign.TOP_LEFT;
			}
			addEventListener(Event.ENTER_FRAME, checkFrame);
			loaderInfo.addEventListener(ProgressEvent.PROGRESS, progress);
			loaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
 
			// TODO show loader
		}
 
		private function ioError(e:IOErrorEvent):void {
			trace(e.text);
		}
 
		private function progress(e:ProgressEvent):void {
			// TODO update loader
		}
 
		private function checkFrame(e:Event):void {
			if (currentFrame == totalFrames) {
				stop();
				loadingFinished();
			}
		}
 
		private function loadingFinished():void {
			removeEventListener(Event.ENTER_FRAME, checkFrame);
			loaderInfo.removeEventListener(ProgressEvent.PROGRESS, progress);
			loaderInfo.removeEventListener(IOErrorEvent.IO_ERROR, ioError);
 
			// TODO hide loader
 
			startup();
		}
 
		private function startup():void {
			var mainClass:Class = getDefinitionByName("Main") as Class;
			addChild(new mainClass() as DisplayObject);
		}
	}
}