/// <summary>
/// Return the item at the given index within the list of leaves governed
/// by this group
/// </summary>
/// <param name="index">Index of the leaf</param>
/// <returns>Item at given index</returns>
internal object LeafAt(int index)
{
for (int k = 0, n = this.Items.Count; k < n; ++k)
{
CollectionViewGroupInternal subgroup = this.Items[k] as CollectionViewGroupInternal;
if (subgroup != null)
{
// current item is a group - either drill in, or skip over
if (index < subgroup.ItemCount)
{
return(subgroup.LeafAt(index));
}
else
{
index -= subgroup.ItemCount;
}
}
else
{
// current item is a leaf - see if we're done
if (index == 0)
{
return(this.Items[k]);
}
else
{
index -= 1;
}
}
}
return(null);
}
