private async void FileTransferPage_BackRequested(object sender, BackRequestedEventArgs e)
{
IFileTransferService service = AppObjects.Instance.Device.GetService(InkDeviceService.FileTransfer) as IFileTransferService;
if ((service != null) && service.IsStarted)
{
await service.StopAsync(m_cts.Token);
}
if (Frame.CanGoBack)
{
Frame.GoBack();
}
}
