Get current state of blend tree ?

Hi,

Ok I can check to see if a animation is playing in a sub state machine like below.

Code (JavaScript):

1. private var idleState = Animator.StringToHash("Locomotion.Idle");  
2. function Start (){
3.      _anim = GetComponent.<Animator>();                    
4. }
5. function Update ()
6. {
7.      currentBaseState = _anim.GetCurrentAnimatorStateInfo(0);
8.      if (currentBaseState.nameHash == idleState){
9.           // Do Stuff
10.      }
11. }

But I can't seem to check a blend tree like below, anyone know how to check a blend tree state?

Thanks.