<code C#>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Drawing;
using System.ComponentModel;

namespace Properties
{
    public enum Size { small, medium, large };

    public class D
    {
        public string Text { get; set; }
        public double Value { get; set; }


    }
    public class C
    {
            [Browsable(true)]
        [DisplayName("Jmeno")]
        public string Name { get; set; }

        [Category("Souradnice")]
        [Description ("x-ova souradnice") ]
        public int X { get; set; }

        [Category("Souradnice")]
        public int Y { get; set; }

        [Category("Souradnice")]
        public int Z { get; set; }

        public Color color { get; set; }
        public Size size { get; set; }

        public List <string> Notes { get; set; }
        public List <double> Parameters { get; set; }
        public List <D> Items { get; set; }


        public C()
        {
            Name = "abc";
            X = 1;
            Y = 2;
            Z = 3;
            color = Color.Orange;
            size = Size.medium;

            Notes = new List<string> { "def", "klm" };
            Parameters = new List<double> { 0.1, 0.2 };

            Items = new List <D> ();
            D item = new D ();
            item.Text = "nazev";
            item.Value = 2.34;
            Items.Add (item);
        }

    }
}

</code>

<code C#>
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using System.IO;
using System.Xml.Serialization;

namespace Properties
{
    public partial class Form1 : Form
    {
        C data;

        public Form1()
        {
            InitializeComponent();

            data = new C ();
            prop.SelectedObject = data;

            // display (tree.Nodes, this);
            tree.ExpandAll ();
        }

        private void display (TreeNodeCollection target, Control widget)
        {
            TreeNode node = new TreeNode ();
            node.Text = widget.Name + ":" + widget.GetType().Name + " : " + widget.Text;
            node.Tag = widget;
            target.Add (node);

            foreach (Control c in widget.Controls)
            {
                display (node.Nodes, c);
            }
        }

        private void tree_NodeMouseClick (object sender, TreeNodeMouseClickEventArgs e)
        {
            prop.SelectedObject = e.Node.Tag;
        }

        private void openMenuItem_Click(object sender, EventArgs e)
        {
            if (openDialog.ShowDialog() == DialogResult.OK)
            {
                string fileName = openDialog.FileName;

                StreamReader r = new StreamReader (fileName);
                XmlSerializer t = new XmlSerializer(typeof(C));
                
                data = (C) t.Deserialize (r);
                prop.SelectedObject = data;

                r.Close ();
            }
        }

        private void saveMenuItem_Click(object sender, EventArgs e)
        {
            if (saveDialog.ShowDialog() == DialogResult.OK)
            {
                string fileName = saveDialog.FileName;
                // using System.IO;
                // using System.Xml.Serialization;
                StreamWriter w = new StreamWriter (fileName);
                XmlSerializer t = new XmlSerializer (typeof (C));
                t.Serialize (w, data);
                w.Close ();
            }
        }

        private void quitMenuItem_Click(object sender, EventArgs e)
        {
            Close ();
        }

    }
}
</code>