protected void T(object obj)
{
  Window w = new Window() { Width = 1024, Height = 768 };
  w.Show();
  Thread.Sleep(1000);
  w.Close();
}
private void Something()
{
  Thread t = new Thread(new ParameterizedThreadStart(T));
  t.SetApartmentState(ApartmentState.STA);
  t.Priority = ThreadPriority.Normal;
  t.Start();
  GC.Collect();
}