Flex List : ItemsChangedEffect - animation effects when adding and removing items in a list

Have you ever wanted the adding adding and removing of items to a list in flex to be more graceful, flashy, and interesting. There is an option, and it's really a great effect. List instances have itemsChangeEffect baked in. You use an instance of DefaultListEffect for this, and make sure you have variableRowHeights set to true, or you wont get the full effect of the animation. This has been around for a while, but I rarely see it used. You can see here - even with a list with 3000 instances

Here is the test application

Here is the source