private void LoadChildTreeNodes(VvTreeNode node)
        {
            VvTreeNode childnode;

            if (node.GetNodeCount(true) == 1)
            {
                childnode = (VvTreeNode)node.Nodes[0];
                if (Guid.Empty.Equals(childnode.NodeID))
                {
                    node.Nodes.Remove(childnode);
                }
            }
            FolderCollection fldrColl = Vault.DefaultStore.Library.GetChildFolders(node.NodeID);

            foreach (Folder folder in fldrColl)
            {
                childnode = new VvTreeNode(folder.FolderID, folder.Name);
                childnode.Nodes.Add(new VvTreeNode(Guid.Empty, ""));
                node.Nodes.Add(childnode);
            }
            node.Expand();
        }