WPF modeless dialog from MS Excel add-in

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Solved it, courtesy of this link: Running WPF Application with Multiple UI Threads

         var thread = new Thread(() =>
            {
                var wpfWindow = new WPFWindow();
                wpfWindow.Show();
                wpfWindow.Closed += (sender2, e2) => wpfWindow.Dispatcher.InvokeShutdown();

                Dispatcher.Run();
            });

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

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