There are currently no built-in methods and plans for creating animated layouts in Flex 4: /.
, , "setLayoutBoundsPosition" "setLayoutBoundsSize" . "" " " , , . , ( , / ), . , , ( , Tweener/Tweenmax, , "setActualSize" "setLayoutBoundsSize" ..).
TweenMax , , . TweenMax 3 (20 7fps), Spark Effects, . , updateDisplayList .
TweenMax.to(child, duration, {setLayoutBoundsPosition:{x:childX * i, y:childY * i}});