Making scroll view selector menu

[Progeny]

Hi everyone! I'm new to Unity development and NGUI package. I know NGUI is going to save my life!

I'm trying to implement this: http://www.tasharen.com/ngui/ex7.html for making a level selector.
I can manage button's click to start a new scene, simply trigger OnClick()

What I want is having on start the first item centered (highlighted). When I startup the scene it behave like that: http://img109.imageshack.us/img109/7752/schermata20120922alle15.png

But i don't know to what object attach a script and how to shift the first item to the correct position to be centered and highlighted.

Could you help me? Thanks

[Progeny]

I'm now able to recent on startup by doing this in the UICenterOnChild
but how can I access to a specified index panel? suppose I want the last level (we suppose number 5) to be centered, how can I access to the 5th panel?

1.         void Update()
2.         {
3.                 Recenter();
4.         }

[Progeny]

 
solved

GetChild(i);

i is the index of the centered panel

1.                 // Determine the closest child
2.                 for (int i = 0, imax = trans.childCount; i < imax; ++i)
3.                 {
4.                         Transform t = trans.GetChild(i);
5.                         float sqrDist = Vector3.SqrMagnitude(t.position - offsetCenter);
6.  
7.                         if (sqrDist < min)
8.                         {
9.                                 min = sqrDist;
10.                                 closest = t;
11.                         }
12.                 }