Setter on Collision2D.isTrigger

Hi,

i'm trying to achieve change object's isTrigger option on click. This is my update and setColl functions.

Code (csharp):

1. void Update () {
2.         if (Input.touchCount == 1  Input.GetTouch(0).deltaTime > 1f  BalderBrain.isGameOn)
3.         {
4.             Vector3 wp = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
5.             Vector2 touchPos = new Vector2(wp.x, wp.y);
6.             if (collider2D == Physics2D.OverlapPoint(touchPos))
7.             {
8.                 setColl();
9.                 this.rigidbody2D.gravityScale = 1;
10.                 this.gameObject.tag="Dusuyor";
11.                 Invoke("DestroyMe",2f);
12.             }
13.         }
14.     }

Code (csharp):

1. void setColl(){
2.         this.gameObject.collider2D.isTrigger = true;
3.     }

this doesn't work anyway. gravityScale, tag and Invoke lines are working just fine. But i cannot change objects trigger option. with or without gameObject.