void EnsureItems()
{
if (this.items == null)
{
TreeGrid grid = this.OwnerGrid;
IEnumerable rawItems = null;
if (this.Parent != null)
{
rawItems = grid.ChildrenFunc(this.Parent.items[this.childIndex]);
}
if (rawItems == null)
{
rawItems = emptyItems;
}
this.items = rawItems as IList;
if (this.items == null)
{
// If we don't get an indexable collection as our items, then we must create one.
this.items = rawItems.OfType <object>().ToArray();
}
ObserveItems();
this.flatCount = this.items.Count;
}
}