Mac OSX Thread issue

using System;
using System.Collections.Generic;
using Gtk;
using System.Drawing;

namespace MacGtkTest
{
    static class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            if (args.Length != 1 || (args[0] != "W" && args[0] != "G"))
            {
                Console.WriteLine("Usage: MacGtkTest W|G");
                return;
            }

            if (args[0] == "W")
            {
                System.Threading.Thread t = new System.Threading.Thread(RunGtkLoop);
                t.Start();

                System.Threading.Thread.Sleep(5 * 1000);

                RunWinLoop();
            }
            else
            {
                System.Threading.Thread t = new System.Threading.Thread(RunWinLoop);
                t.Start();

                System.Threading.Thread.Sleep(5 * 1000);

                RunGtkLoop();
            }
        }

        static void RunWinLoop()
        {
            Console.WriteLine("Initializing WinForms");

            System.Windows.Forms.Application.EnableVisualStyles();
            System.Windows.Forms.Application.DoEvents();

            Console.WriteLine("Running WinForms");

            System.Windows.Forms.Application.Run();

            Console.WriteLine("Exiting WinForms");
        }

        static void RunGtkLoop()
        {
            Gtk.Application.Init();

            StatusIcon icon = new StatusIcon();
            icon.Visible = false;

            Console.WriteLine("Initializing GTK icon");

            using (Bitmap bmp = new Bitmap(16, 16))
            {
                using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp))
                {
                    g.Clear(Color.Purple);
                }

                using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
                {
                    bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                    ms.Position = 0;

                    icon.Pixbuf = new Gdk.Pixbuf(ms);
                }
            }

            Console.WriteLine("Setting GTK event handlers");

            icon.PopupMenu += new PopupMenuHandler(icon_PopupMenu);
            icon.Activate += new EventHandler(icon_Activate);

            Console.WriteLine("Setting GTK icon visible");

            icon.Visible = true;

            Console.WriteLine("Starting GTK");

            Gtk.Application.Run();

            Console.WriteLine("Exiting GTK");
        }

        static void icon_Activate(object sender, EventArgs e)
        {
            Console.WriteLine("Activate");
        }

        static void icon_PopupMenu(object o, PopupMenuArgs args)
        {
            Console.WriteLine("Popup menu");
        }
    }
}