如何在Flex中使用位图图像创建反射效果？

I'm looking for a simple, clean and memory-efficient way to create and apply a reflection effect (you know the one, popularized by the famed iPhone UI) to the bitmap images I've loaded into a Flex app at runtime. The source images will be of varying types (JPGs, PNGs, etc.), but an acceptable solution can assume each image is already loaded and being stored as BitmapData. I'm looking for a simple, clean and memory-effi