public override void WillEnterForeground(UIApplication application)
        {
            Mvx.TaggedTrace(Tag, "WillEnterForeground");

            BackgroundTimeTimer.Invalidate();
            BackgroundTimeTimer.Dispose();
        }
        public override void DidEnterBackground(UIApplication application)
        {
            Mvx.TaggedTrace(Tag, "DidEnterBackground");

            BackgroundTimeTimer = NSTimer.CreateRepeatingScheduledTimer(1, OnBackgroundTimeTimerAction);
            BackgroundTimeTimer.Fire();
        }