Thanks for your kindness!!
my pong game is using delta X, Y to be able to move pabble at everywhere on screen, so it was little different problem with your solution.
Anyway, i'm interesting in your ball FSM. i don't know how to make ball bounce, so i set vector2D, and set event, when collide vertical, multifly -1 at X, and else Y. but it doesn't looks good. How did you make ball movement?