String to Library Class conversion

Hi guys, i'm having trouble coming up with a good way to
convert a string to class reference from the library without using
a lookup table in Actionscript 3.0
so say i'd loaded in some data from xml and i need to
generate a new instance of a "Box" from a linked extended Sprite in
the library.
without the string i'd just go var myBox = new Box();
but obviously i can't go var myBox = new "Box"() so i'm kind
of stuck without using a lookup table to convert the string passed
to the appropriate Class linkage.
Any help would be much appreciated,

flash.utils.getDefinitionByName()
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/utils/package.html#getDefi nitionByName()

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