How to create a dashed line rounded rectangle in Flex?

How can I create a rounded rectangle with a dashed line? I've seen several routines that draw their own straight lines, but nothing for 开发者_开发问答rounded rectangles.

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There used to be (probably still is) a great AS 2/3 library for this but I can't find it.

This looks pretty promising:

http://blog.alegitimatebusiness.com/2007/11/07/as2-as3-draw-a-dotted-rounded-corner-box/