CairoDesktop.MenuBar.OpenShutDownBox C# (CSharp) Method

        private void OpenShutDownBox(object sender, RoutedEventArgs e)
        {
            bool? ShutdownChoice = CairoMessage.ShowOkCancel("You will lose all unsaved documents and your computer will turn off.", "Are you sure you want to shut down now?", "Resources/shutdownIcon.png", "Shut Down", "Cancel");
            if (ShutdownChoice.HasValue && ShutdownChoice.Value)
            {
                NativeMethods.Shutdown();
            }
            else
            {
            }
        }