AS3 - dynamic class names with *new* operator

Question

I'm using AcrtionScript 3 and Adobe Flash 9 Public Alpha.
I have 50 movie clips in the Library that use Linkage to set
the Class name to: Img1, Img2, Img3, ..., Img50.
I have a parent class named RandImg. I want the constructor
for RandImg to randomly select one of the 50 movie clips from the
Library and display it. I could get this working by generating a
random number, and then writing a really huge switch statement to
associate each possible random number with its respective Library
Movie Clip Class name, but I would much rather do this with a
dynamic/variable class name based on the random number, such as:
var nImgChoice:Number = Math.floor( Math.random( ) * 50 ) +
1;
var mcImg:MovieClip = new [ "Img"+String(nImgChoice) ] ( );
addChild( mcImg );
Note that this used to be possible in AS 2 by doing the
following:
this.attachMovie( "Img"+String(nImgChoice) , "mcImg",
this.getNextHighestDepth());
Suggestions?
Thanks,
~JC

Answer 1

import flash.display.DisplayObject;
import flash.display.Sprite;
import flash.utils.getDefinitionByName;
var nImgChoice:Number = Math.floor( Math.random( ) * 50 ) +
1;
var ClassReference:Class =
getDefinitionByName("Img"+String(nImgChoice) ) as
Class;
var instance:Object = new ClassReference();
addChild(DisplayObject(instance));