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Storyboards for Custom Control not visible after OnNavigatedFrom (back to MainPage)
public IrisLogo()
    {
        // Required to initialize variables
        InitializeComponent();
        ProgressBarRotate.Begin();

        var dispatchTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(50) };
        dispatchTimer.Tick += DispatcherTimerTick;
        dispatchTimer.Start();
    }

    private void DispatcherTimerTick(object sender, EventArgs e)
    {
        if (AmplitudeIsChanging)
        {
            ChangeLogoAmplitude();
            AmplitudeIsChanging = false;
        }

        if (ProgressBarCircle.Visibility == Visibility.Visible && !_irisIsOpened)
        {
            OpenIris.Begin();
            _irisIsOpened = true;
        }

        if (ProgressBarCircle.Visibility == Visibility.Collapsed && _irisIsOpened)
        {
            CloseIris.Begin();
            _irisIsOpened = false;
        }
    }

    public void ChangeLogoAmplitude()
    {
        var amplitudeInt = Convert.ToInt32(LogoAmplitude);
        _previousAmpStory = _levelAmp;

        _levelAmp = DetectAmpLevel();

        if (_previousAmpStory > 0)
        {
            var oldStory = (Storyboard)Resources["AmpStory" + _previousAmpStory.ToString(CultureInfo.InvariantCulture)];
            if (oldStory.CheckAccess())
                oldStory.Stop();
        }

        if (_levelAmp > 0)
        {
            var currentStory = (Storyboard)Resources["AmpStory" + _levelAmp.ToString(CultureInfo.InvariantCulture)];
            if (currentStory.CheckAccess())
                currentStory.Begin();
        }
        else
        {
            _levelAmp = 0;
        }
    }