Papervision3d Scene3D getChildAt method undefined?

package org.papervision3d.core.proto
{
	import org.papervision3d.Papervision3D;
	import org.papervision3d.core.log.PaperLogger;
	import org.papervision3d.materials.utils.MaterialsList;
	import org.papervision3d.objects.DisplayObject3D;
	
	/**
	* The SceneObject3D class is the base class for all scenes.
	* <p/>
	* A scene is the place where objects are placed, it contains the 3D environment.
	* <p/>
	* The scene manages all objects rendered in Papervision3D. It extends the DisplayObjectContainer3D class to arrange the display objects.
	* <p/>
	* SceneObject3D is an abstract base class; therefore, you cannot call SceneObject3D directly.
	*/
	public class SceneObject3D extends DisplayObjectContainer3D
	{		
		/**
		* Contains a list of DisplayObject3D objects in the scene.
		*/
		public var objects :Array;
	
		/**
		* It contains a list of materials in the scene.
		*/
		public var materials:MaterialsList;
		
		/**
		* The SceneObject3D class lets you create scene classes.
		*
		* @param	container	The Sprite that you draw into when rendering. If not defined, each object must have it's own private container.
		*/
		public function SceneObject3D()
		{
			this.objects = new Array();
			this.materials = new MaterialsList();
	
			PaperLogger.info( Papervision3D.NAME + " " + Papervision3D.VERSION + " (" + Papervision3D.DATE + ")\n" );
 
			this.root = this;
		}
	
		/**
		* Adds a child DisplayObject3D instance to the scene.
		*
		* If you add a GeometryObject3D symbol, a new DisplayObject3D instance is created.
		*
		* [TODO: If you add a child object that already has a different display object container as a parent, the object is removed from the child list of the other display object container.]
		*
		* @param	child	The GeometryObject3D symbol or DisplayObject3D instance to add as a child of the scene.
		* @param	name	An optional name of the child to add or create. If no name is provided, the child name will be used.
		* @return	The DisplayObject3D instance that you have added or created.
		*/
		public override function addChild( child:DisplayObject3D, name:String=null ):DisplayObject3D
		{
			var newChild:DisplayObject3D =	super.addChild( child, name ? name : child.name );
			child.scene = this;
			child.parent = null;
			this.objects.push( newChild );
			return newChild;
		}
	
		/**
		* Removes the specified child DisplayObject3D instance from the child and object list of the scene.
		* </p>
		* [TODO: The parent property of the removed child is set to null, and the object is garbage collected if no other references to the child exist.]
		* </p>
		* The garbage collector is the process by which Flash Player reallocates unused memory space. When a variable or object is no longer actively referenced or stored somewhere, the garbage collector sweeps through and wipes out the memory space it used to occupy if no other references to it exist.
		* </p>
		* @param	child	The DisplayObject3D instance to remove.
		* @return	The DisplayObject3D instance that you pass in the child parameter.
		*/
		public override function removeChild( child:DisplayObject3D ):DisplayObject3D
		{
			super.removeChild( child );
	
			for (var i:int = 0; i < this.objects.length; i++ )
			{
				if (this.objects[i] === child )
				{
					this.objects.splice(i, 1);
					return child;
				}
			}
			return child;
		}
		
		/*dreammonkey's go at getChildAt method*/
		
		public function getChildAt( index:Number ):DisplayObject3D
		{
			//super.getChildAt( index );
	
			for (var i:int = 0; i < this.objects.length; i++ )
			{
				if (i === index )
				{
					
					return this.objects[i];
				}
			}
			return this.objects[i];
		}
				
			
	}
}

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package {
	import org.papervision3d.core.proto.SceneObject3D;
 
	class MySceneObject3D extends SceneObject3D {
		public function getChildAt( index:Number ):DisplayObject3D {
			if (index>this.objects.length) {
				return null;
			}// or maybe throw an exception?
			return this.objects[index];
		}
	}
}

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