How to sync two independent NGUI Scroll Views?

Hey Guys, I want to sync two different NGUI ScrollViews in Horizontal manner. In my app, 2 scroll views having grid with equal number of items are in the same screen, they need to be linked through some logic so that, if I move/swipe an item (say index 3) of scrollview1 then item with index 3 of ScrollView2 should also move with it, without me ever touching that ScrollView2.

Also, I need a spring effect at the both ends of both the scroll views when I swipe either of the two scroll views at first or last item of the grid.

So far I've done this for the end spring effect through tween positioning, but it's not working accordingly and the bottom grid is repositioning itself at the center.

 if(mainGrid.GetComponent <UICenterOnChild> ().index==0)// || mainGrid.GetComponent <UICenterOnChild> ().index==(mainGrid.transform.childCount-1))
 {
     if(Input.touchCount>0)
     {
         Touch touch = Input.GetTouch(0);
         switch (touch.phase) 
         {
             case TouchPhase.Began:
             startPos = touch.position;
             bottomGrid.AddComponent<TweenPosition> ();
             bottomGrid.GetComponent<TweenPosition> ().from = new Vector3(0,-500,0);
             bottomGrid.transform.localPosition = new Vector3 (0,-500,0);
             break;
 
             case TouchPhase.Moved:
             distanceMoved += 6;
             swipeValue = Mathf.Sign(touch.position.x - startPos.x);
             //    bottomGrid.AddComponent<TweenPosition>();
             if (swipeValue > 0)
             {
                 bottomGrid.GetComponent<TweenPosition> ().from = new Vector3(initDistance,-500,0);
                 bottomGrid.GetComponent<TweenPosition>().to = new Vector3(distanceMoved,-500,0);
                 bottomGrid.GetComponent<TweenPosition> ().duration = 0.15f;
                 bottomGrid.GetComponent<TweenPosition> ().PlayForward ();
         //        StartCoroutine(ArtificialSpringRight());
                 rightMove = true;
             }
             startPos = touch.position;
             initDistance += distanceMoved;
             break;
                                         
             case TouchPhase.Ended:
         //    bottomGrid.AddComponent<TweenPosition>();
             if(rightMove)
             {
             //    bottomGrid.GetComponent<TweenPosition> ().duration = 0.2f;
                 bottomGrid.GetComponent<TweenPosition> ().from = new Vector3(distanceMoved,-500,0);
                 bottomGrid.GetComponent<TweenPosition>().to = new Vector3(0,-500,0);
                 bottomGrid.GetComponent<TweenPosition> ().duration = 0.2f;
                 bottomGrid.GetComponent<TweenPosition> ().PlayForward ();
                 yield return new WaitForSeconds(0.2f);
                 Destroy (bottomGrid.GetComponent<TweenPosition> ());
                 rightMove = false;
             }
             initDistance = 0;
             distanceMoved = 0;    
 
             break;
         }
     }
 }