(when using v6.6 and v6.7)
- want to be able to sort the state machine sidebar manually. 
- why animation is automatically triggered when enter the scene? will it automatically execute the first animation I created?  (a temporary solution is to create a dummy animation with the same duration but without any movement. And put the conditional script of triggering that animation on the top of other animation script — which means you should first create the script to trigger dummy animation)