クラスを変数で

http://umroom.com/blog/archive/2009/01/142012.html
[sourcecode language="java"]
for(var i:uint=1; i<=10; i++){
  var className = getDefinitionByName("MyClass"+i) as Class;
  var sprite = new className();
  addChild( Sprite(sprite) );
}
[/sourcecode]

ちなみにas2だとこうだって

[sourcecode language="java"]
var className:String = "MyClass";
var instance:MyClass = new [className]();
[/sourcecode]

http://www.studio-hedgehog.com/blog/2007/12/flashutilsgetdefinitionbyname.html