C#

 using System;
using System.Windows.Forms;
using System.Drawing;
using System.Threading;
namespace GeoObjects
{
	/// <summary>
	/// 
	/// </summary>
	class FillIn
	{
		static GeoObjects.GeoTOC m_pGeoTOC;
		public FillIn(GeoTOC toc)
		{
			m_pGeoTOC = toc;
		}
		public static void Process()
		{
			m_pGeoTOC.UpdateTableThread();
		}
	}
	public class GeoTOC : System.Windows.Forms.TreeView
	{
		private System.ComponentModel.IContainer components;
		private System.Windows.Forms.ImageList imageList_LayersColor;
		GeoMapControl m_pGeoMapControl;
		public GeoTOC()
		{
			// 
			// TODO: Add constructor logic here
			//
			InitializeComponent();
		}

		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.imageList_LayersColor = new System.Windows.Forms.ImageList(this.components);
			// 
			// imageList_LayersColor
			// 
			this.imageList_LayersColor.ImageSize = new System.Drawing.Size(16, 16);
			this.imageList_LayersColor.TransparentColor = System.Drawing.Color.Transparent;
			// 
			// GeoTOC
			// 
			this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.CheckBoxes = true;
			this.ImageIndex = 0;
			this.ImageList = this.imageList_LayersColor;
			this.SelectedImageIndex = 0;

		}
#region  Accessors
		public GeoMapControl MapControl
		{
			set
			{
				m_pGeoMapControl = value;
				m_pGeoMapControl.TOC = this;
			}
		}
#endregion
		public void UpdateTableThread()
		{
			this.BeginUpdate();
			Nodes.Clear();
			imageList_LayersColor.Images.Clear();
			System.Drawing.Bitmap img = new System.Drawing.Bitmap(16,16);
			Graphics g = Graphics.FromImage(img);
			g.Clear(Color.White);
			g.Dispose();
			imageList_LayersColor.Images.Add(img);
			foreach(GeoMapTable gmt in m_pGeoMapControl.MapTables)
			{
				TreeNode Map = Nodes.Add(gmt.Name);
				Map.Checked = gmt.Visible;
				Map.ForeColor = Color.Blue;
				foreach(GeoLayer gl in gmt.Layers)
				{
					img = new System.Drawing.Bitmap(16,16);
					g = Graphics.FromImage(img);
					g.Clear(Color.White);
					g.FillRectangle(new SolidBrush(gl.LayerColor),3,3,11,11);
					g.Dispose();
					imageList_LayersColor.Images.Add(img);
					TreeNode layer = Map.Nodes.Add(gl.Name);
					layer.Checked = gl.Visible;
					layer.ImageIndex = imageList_LayersColor.Images.Count-1;
					layer.SelectedImageIndex = imageList_LayersColor.Images.Count-1;
				}
			}
			this.EndUpdate();
		}
		public void UpdateTable()
		{
			FillIn fi = new FillIn(this);
			Thread mythread = new Thread(new ThreadStart(FillIn.Process));
			mythread.Start();
		}
		protected override void OnAfterCheck(TreeViewEventArgs e)
		{
			TreeNode parent = e.Node.Parent;
			if(parent==null)
				((GeoMapTable)m_pGeoMapControl.MapTables[e.Node.Index]).Visible = e.Node.Checked;
			else
				((GeoLayer)((GeoMapTable)m_pGeoMapControl.MapTables[parent.Index]).Layers[e.Node.Index]).Visible = e.Node.Checked;
			m_pGeoMapControl.PaintMap();
			base.OnAfterCheck (e);
		}
	}
	
	
}