How to render open TK GameWindow App with Win Forms ?

http://www.opentk.com/node/4026

1) Run WinForm and GameWindow App in two different thread as below

using System;
using System.Threading;
using System.Windows.Forms;
using Debug = System.Diagnostics.Debug;
using OpenTK;
using OpenTK.Graphics.OpenGL;
 
namespace OpenTKWinForms
{
 class MainClass
 {
  static GameWindow window;
  static Form form;
  static OpenTK.Graphics.Color4 color;
 
  public static void Main(string[] args)
  {
   // OPTION 1: Start windows form in a new thread.
   // Form is created either here or inside ThreadStart.
//   form = new Form();
//   form.Click += Form_Click;
//   var threadForm = new Thread(new ThreadStart(() => {
//    form = new Form();
//    form.Click += Form_Click;
//    Application.Run(form);
//   }));
//   threadForm.Start();
 
//   window = new GameWindow();
//   window.RenderFrame += Window_RenderFrame;
//   window.Run(2.0, 2.0);
 
   // OPTION 2: Start OpenTK window in a new thread.
//   var threadOpenTK = new Thread(new ThreadStart(() => {
//    window = new GameWindow();
//    window.RenderFrame += Window_RenderFrame;
//    window.Run(2.0, 2.0); 
//   }));
//   threadOpenTK.Start();
//
//   form = new Form();
//   form.Click += Form_Click;
//   Application.Run(form);
  }
 
  static void Form_Click (object sender, EventArgs e)
  {
   var r = new Random();
   var c1 = new float[]
   {
    (float)r.NextDouble(),
    (float)r.NextDouble(),
    (float)r.NextDouble()
   };
   var c2 = new int[]
    {
     (int)(c1[0] * 255),
     (int)(c1[1] * 255),
     (int)(c1[2] * 255)
    };
 
   color = new OpenTK.Graphics.Color4(c1[0], c1[1], c1[2], 1f);
   form.BackColor = System.Drawing.Color.FromArgb(c2[0], c2[1], c2[2]);
  }
 
  static void Window_RenderFrame (object sender, FrameEventArgs e)
  {
   GL.ClearColor(color);
   Debug.WriteLine(color);
   GL.Clear(ClearBufferMask.ColorBufferBit);
   window.SwapBuffers();
  }
 }
}