Is there an Actionscript library that can be used to target Flex components in the display list using an xpath-like syntax?

I feel like I've seen something like this before, but not sure where and searches aren't turning up anything useful. A library like this would evaluate xpath-like string开发者_运维问答 expressions that would resolve to references to actual components (if they exist) in a Flex application's display list tree.

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these might help:

http://code.google.com/p/xpath-as3/wiki/GettingStarted

http://flexcomps.wordpress.com/2008/04/14/xpath-with-as3/

http://apdevblog.com/actionscript3-e4x-and-xpath/

http://lab.arc90.com/2010/04/28/actionscript-3-xpath-library/

How can I use XPath with AS3 and get a result that still reffereced to the XMLDocument object?