[Spine2D] How to change the color of material of a skeleton object c-sharp

Hello, I try to change the color of a material of a Skeleton but I can't. Here the Skeleton GameObject : ![alt text][1] I tryed this, it's work well on ohter GameObject but not with Spine skeleton ``` gameObject.renderer.material.color = Color.red; gameObject.renderer.materials [0].color = Color.red; gameObject.GetComponent ().material.color = Color.blue; gameObject.GetComponent ().material.SetColor ("_TintColor", Color.blue); gameObject.GetComponent ().material.SetColor ("_Color", Color.blue); ``` [1]: http://i.imgur.com/RUHclG1.png