GTK# Window Non-Resizable Bug
===

I am trying to make a window not resizable by calling "myWindow.Resizable = false;", but when I do that, the window's right edge and bottom snap to the button instead of maintaining the default size that I specify. What gives?
    
    using System;
    using Gtk;

    class WindowTester {
	static void Main ()
	{
		
         Application.Init ();
		Window myWindow = new Window ("This is a window");
		myWindow.DeleteEvent += OnDelete;
		myWindow.Resizable = false;    
		myWindow.SetDefaultSize(600, 400);

		//Put a button in the Window
		Button button = new Button ("Click");
		button.SetSizeRequest(75,30);
		Fixed container = new Fixed();
        container.Put(button, 500, 350);

		myWindow.Add (container);
		myWindow.ShowAll ();
		Application.Run ();
	}

	static void OnDelete (object o, DeleteEventArgs e)
	{
		Application.Quit ();
	}	
}