public virtual TreeNodeEx Add(string text)
        {
            TreeNodeEx treeNode = new TreeNodeEx(text);

            _owner.Nodes.Add(treeNode);
            return(treeNode);
        }
 public virtual void Add(TreeNodeEx node)
 {
     _owner.Nodes.Add(node);
 }
 public TreeNodeCollectionEx(TreeNodeEx owner)
 {
     _owner = owner;
 }