How do I create and show WPF windows on separate threads?

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As msdn states:

private void NewWindowHandler(object sender, RoutedEventArgs e)
{       
    Thread newWindowThread = new Thread(new ThreadStart(ThreadStartingPoint));
    newWindowThread.SetApartmentState(ApartmentState.STA);
    newWindowThread.IsBackground = true;
    newWindowThread.Start();
}

private void ThreadStartingPoint()
{
    Window1 tempWindow = new Window1();
    tempWindow.Show();       
    System.Windows.Threading.Dispatcher.Run();
}

EDIT:
this IS an old answer, but since it seems to be visited often, I could also think of the following modifications/improvements (not tested).

If you would like to close such a window, simply keep a reference to the Window object from outside of the thread (delegate), and then invoke close on it, something like this:

void CloseWindowSafe(Window w)
{
    if (w.Dispatcher.CheckAccess())
        w.Close();
    else
        w.Dispatcher.Invoke(DispatcherPriority.Normal, new ThreadStart(w.Close));
}

// ...
CloseWindowSafe(tempWindow);

If the new thread could become terminated (aborted forcibly), in line with question in comments:

private void ThreadStartingPoint()
{
    try{
        Window1 tempWindow = new Window1();
        tempWindow.Show();       
        System.Windows.Threading.Dispatcher.Run();
    }
    catch(ThreadAbortException)
    {
        tempWindow.Close();
        System.Windows.Threading.Dispatcher.InvokeShutdown();
    }
    //the CLR will "rethrow" thread abort exception automatically
}

DISCLAIMER: don’t do this at home, aborting threads is (almost always) against best practices. Threads should be gracefully handled via any of the various synchronization techniques, or in this case, simply via an invoked window.Close()

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