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    <p>You can add an event listener to the stage and use <code>Event.ADDED</code> to get a reference to any display object added anywhere in the display list. </p> <p>Then simply type cast if the added item is a subclass of <code>ManagedSprite</code> (BTW, the convention is to start your class names with an uppercase letter):</p> <pre><code>stage.addEventListener (Event.ADDED, onAdded); function onAdded( ev:Event ):void { if (ev.target is ManagedSprite) { var managed:ManagedSprite = ManagedSprite( ev.target ); doStuffWith( managed ); } } </code></pre> <p><strong>EDIT</strong> </p> <p>I think I only just understood your question: You are not trying to do an actual type cast - which would require your class hierarchy to be already set up, i.e. you'd have to have extended the ManagedSprite class already - but to add functionality at runtime!</p> <p>I would strongly discourage you from trying to do deep copies or such - it will be heavy on performance, depending on how many sprites you are going to add, and you will no longer have your compiler to help you prevent errors. </p> <p>Rather, see if you can't favor composition over inheritance: Create a kind of "proxy" class for the sprite, let's call it <code>ManagedSpriteProxy</code>, which implements all the methods you would call on ManagedSprite, but forwards all the actual manipulations to its `managedSprite' property. Then use the event handler I outlined above to create the proxy objects and attach the respective sprites:</p> <pre><code>public class ManagedSpriteProxy { private var _managedSprite:Sprite; public function ManagedSpriteProxy( managedSprite:Sprite ) { this.managedSprite = managedSprite; } public function get managedSprite():Sprite { return _managedSprite; } public function set managedSprite( managedSprite : Sprite ):void { _managedSprite = managedSprite; setUpAnyHandlersOrWhatever(); } private function setUpAnyHandlersOrWhatever():void { // Many wonderful things happening } // Many more wonderful things happening via public API } // somewhere else public class SpriteManager { private var _managedSprites:Array = []; public function SpriteManager() { addEventListener( Event.ADDED_TO_STAGE, onAddedToStage ); } private function onAddedToStage( ev:Event ):void { removeEventListener( Event.ADDED_TO_STAGE ); stage.addEventListener( Event.ADDED, onAdded ); } private function onAdded( ev:Event ):void { if( ev.target is Sprite ) { addWithProxy( ev.target as Sprite ); } } private function addWithProxy( sprite:Sprite ) : void { var proxy:ManagedSpriteProxy = new ManagedSpriteProxy( sprite ); _managedSprites.push( proxy ); } // Insert here whatever methods used to manage the sprites, // all of them call the proxies instead of the sprites! } </code></pre>
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    1. COthanks, but this still means that if I have a sprite as event.target, I will not be able to cast it to ManagedSprite. What I want to do is cast the sprite into the MangedSprite super class, essentially a deepcopy, but I cannot deepcopy all types of displayobjectcontainer - such as movieclip; as a matter of fact there don't seem to be any deepcopy methods or libraries available that might do this; the standard bytearray.read() trick doesn't work if casting it to a subclass of an object (although I've just realised that I might be able to do some byte manipulation plus casting so I'll try that.
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    2. COI've edited my answer - please have a look.
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    3. COthanks for your well illustrated answser. I've tried the proxy class idea, compositing the superclass type in to the managed class is ok, but I want the managed class to extend the superclass so that I can perform succesful rtti and casts, and not have to implement all of the methods of the superclass in the proxy.
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