/// <summary>
/// Returns the children tree for the given <see cref="sid" />
/// </summary>
/// <param name="sid"></param>
/// <returns></returns>
internal BinarySearchTree<CFItem> GetChildrenTree(int sid)
{
var binarySearchTree = new BinarySearchTree<CFItem>(new CFItemComparer());
// Load children from their original tree.
DoLoadChildren(binarySearchTree, _directoryEntries[sid]);
// Rebuild of (Red)-Black tree of entry children.
binarySearchTree.VisitTreeInOrder(RefreshSIDs);
return binarySearchTree;
}