AS3 Load swf As Movieclip - actionscript-3

Question

I need to load in an external swf and be able to use it as a Movieclip in FlashDevelop i.e I need to be able to go to specific keyframes, start and stop it playing etc. Some simple working sample code would be hugely appreciated as I cannot find any satisfactory tutorials through Google.
EDIT
I now have this code
package
{
import flash.net.*;
import flash.display.*;
import flash.events.*;
import flash.utils.getQualifiedClassName;
public class Main extends MovieClip
{
var animatedBox:MovieClip = new MovieClip();
var ldr:Loader = new Loader();
var frames:int = 0;
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);
ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, onload);
ldr.load(new URLRequest("../lib/test.swf"));
}
function onload(e:Event)
{
if ( !e.target )
return;
if( e.target.content is MovieClip )
{
animatedBox = e.target.content as MovieClip;
animatedBox.gotoAndPlay("Start");
}
else
{
trace( getQualifiedClassName( e.target.content ) );
}
}
}
}
After I try to run it I get [Fault] exception, information=TypeError: Error #1009: Cannot access a property or method of a null object reference.
Any ideas?

Answer 1

import flash.utils.getQualifiedClassName;
var mc: MovieClip;
var ldr: Loader = new Loader();
ldr.contentLoaderInfo.addEventListener( Event.COMPLETE, onLoad );
ldr.load( new URLRequest("your.swf") );
function onLoad( e:Event ):void
{
if( !e.target )
return;
trace( getQualifiedClassName( e.target.content ) );
/* if you get: flash.display::AVM1Movie
it means you are trying to load an AS1 or AS2 SWF
into AS3 SWF. They both need to be AS3 */
mc = e.target.content as MovieClip;
mc.gotoAndPlay( 2 );
// or mc.gotoAndPlay( 'yourLabel' );
}