I use a TileList component quite often when building Flex applications. Recently, I was asked to create a nice, smooth, horizontal scrolling effect for a TileList containing a 3×3 page grid of 40 or so images. After many unsuccessful attempts to cajole the TileList into the proper behavior, I decided to roll my own.
It seems the fundamental problem with the TileList, which extends from the ListBase class, is its management of item renderers. It gets confused when attempting an animation to change the horizontal scroll position using an AnimateProperty effect. It seems that item renderers get confused when moving items into view using an effect.