Open new window with its own UI thread.

The code below speaks for itself on how to open multiple windows which have there own dispatcher.
private void CreateNewWindow()
  {
   Thread thread = new Thread(() =>
    {
     Window1 w = new Window1();
     w.Show();

     w.Closed += (sender2, e2) =>
      w.Dispatcher.InvokeShutdown();

     System.Windows.Threading.Dispatcher.Run();
    });

   thread.SetApartmentState(ApartmentState.STA);
   thread.Start();
  }

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