public static FilterTreeNode AddRootNode(TreeView tree, Filter rootItem)
        {
            FilterTreeNode root = new FilterTreeNode();

            root.Item = rootItem;
            tree.Nodes.Add(root);
            return(root);
        }
 public static void AddChildNodes(TreeNode parent, List <SpendFilter> filters)
 {
     foreach (var filter in filters)
     {
         FilterTreeNode node = new FilterTreeNode();
         node.Item = filter;
         parent.Nodes.Add(node);
     }
 }