Flash Tip collection 10 : Rotating Around Point

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@author YopSolo

The flash API do not provide a way to change the Pivot of a display object
but I found a class called MatrixTransformer in the fl.motion package that can allow to do it quickly
via the static method rotateAroundInternalPoint
documentation 
http://help.adobe.com/fr_FR/FlashPlatform/reference/actionscript/3/fl/motion/MatrixTransformer.html
the class can be found in flex sdk