[WPF, MVVM Light] WPF MVVM Light Toolkit에서 새 창 열기

Window Code behind

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Closing += (s, e) => ViewModelLocator.Cleanup();

        Messenger.Default.Register<NotificationMessage>(this, (message) =>
        {
            switch(message.Notification)
            {
                case "ShowTestWindow":
                    {
                        var testWindow = new TestWindow();
                        testWindow.Show();
                        break;
                    }
            }
        });
    }
}