private VirtualList CreateNewVirtualList() { Debug.Assert(m_isBottomLevel); DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView(); DataGridPageManagerBase virtualPageManagerBase = collectionView.RootGroup.GetVirtualPageManager(); VirtualList virtualItemList = new VirtualList(virtualPageManagerBase, m_virtualItemCount); virtualPageManagerBase.LinkVirtualListAndCollectionViewGroup(virtualItemList, this); return(virtualItemList); }