about do static batching dynamicly

 void Start()
     {
         var gos = new GameObject[10];
         for (var i = 0; i < 10; i++)
         {
             var go = Instantiate(Prefab) as GameObject;
             go.transform.parent = gameObject.transform;
             gos[i] = go;
         }
 
         StaticBatchingUtility.Combine(gos, gameObject);
     }

1. prefab is static

2. player setting with static batching checked

no batching occured. but i found sample code, i really confused.