private async void restartButton_Click(object sender, RoutedEventArgs e)
{
var dialog = new MessageDialog("Are you sure you want to restart the device?", "IoTHelpers");
dialog.Commands.Add(new UICommand("Yes", (cmd) => ShutdownManager.Restart()));
dialog.Commands.Add(new UICommand("No"));
dialog.CancelCommandIndex = 1;
await dialog.ShowAsync();
}