I meet a bug with UIScrollBar

[woshihuo12]

bagPanel (panel uiscrollview)
  |-------bagContents ( UITable)
                |----------------bagItem
                |----------------bagItem
                |----------------bagItem

i set bagPanel's uiscrollview's Scroll Bars show condition to "OnlyIfNeeded"...
and i add some bagItems use  StartCoroutine(InitBagItems());
public IEnumerator InitBagItems()
{       
...
                AddRecordItem();
...
}

i notice that i have many items and the scroll bar shows, but i can't drag the scroll bar, because it's boxcollider is disabled..
so can i have some helps???
thanks................

[ArenMook]

Seems to work fine in the quest log example. Did you ever notify the scroll view that the content changed? panel.UpdateScrollbars(true)