protected virtual void OnEnable () {
		utilBone = GetComponent<SkeletonUtilityBone>();
		skeletonUtility = SkeletonUtility.GetInParent<SkeletonUtility>(transform);
		skeletonUtility.RegisterConstraint(this);
	}
 protected virtual void OnEnable()
 {
     utilBone        = GetComponent <SkeletonUtilityBone>();
     skeletonUtility = SkeletonUtility.GetInParent <SkeletonUtility>(transform);
     skeletonUtility.RegisterConstraint(this);
 }