[Gtk-sharp-list] Changing widgets visual properties (wiewport backgrounds, labels) bug

[Piotr Budny]

Hello,
for all, who don't want to download external code, here's the simplest one.
It still randomly SIGSEGVs.

using System;
using System.Threading;
using Gtk;

namespace testbg
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			Application.Init ();
			MainWindow win = new MainWindow ();
			win.Show ();

			Sig s = new Sig();
			
			Application.Run ();
		}
	}

	public class MainWindow : Gtk.Window
	{
		Label l;
		public MainWindow (): base(Gtk.WindowType.Toplevel)
		{
			l = new Label();
			l.Text = "asd dsaas dsa jkhdas ";

			Sig.Changed += new ChangedEventHandler(this.OnChanged);

			this.Add(l);
			ShowAll();
		}
		protected void OnChanged(string s)
		{
			Random r = new Random();
			l.Text = String.Format("blah blah: {0}, {1}", r.Next(), s);
			l.ModifyBg (Gtk.StateType.Normal, new Gdk.Color ((byte)r.Next(), 
(byte)r.Next(),(byte) r.Next()));
		}
	}


	public  delegate void ChangedEventHandler(string test);

	public class Sig
	{
		public static event ChangedEventHandler Changed;
		
		public Sig()
		{
			Thread t = new Thread(new ThreadStart(ThreadProc));
			t.Start();
		}

		protected virtual void ThreadProc() 
		{
			while(true)
			{
				Thread.Sleep(50);

				if (Changed != null)
					Changed("u");
			}
		}
	}
}

Regards,
Piotr Budny