Zooming using transform Matrix

Here is a brilliant post ‘Zooming in Flash & Flex’ on how to use the transform Matrix to zoom and rotate DisplayObjects. Daniel Gasienica writes well and has some great examples demonstrating to correct way to apply these transformations to your clips.
Using this method saves you messing around with the Point class and localToGlobal / globalToLocal methods. This solution is elegant and efficient.

http://gasi.ch/blog/zooming-in-flash-flex/