public MainViewModel()
        {
            var dummyDataProvider = new DummyDataProvider();
            var lineData          = new XyDataSeries <double, double>()
            {
                SeriesName = "TestingSeries"
            };

            _renderableSeries = new ObservableCollection <IRenderableSeriesViewModel>();
            RenderableSeries.Add(new LineRenderableSeriesViewModel()
            {
                StrokeThickness = 2,
                Stroke          = Colors.SteelBlue,
                DataSeries      = lineData,
                StyleKey        = "LineSeriesStyle"
            });

            // Append the initial values to the chart
            var initialDataValues = dummyDataProvider.GetHistoricalData();

            lineData.Append(initialDataValues.XValues, initialDataValues.YValues);

            // Subscribe to future updates
            dummyDataProvider.SubscribeUpdates((newValues) =>
            {
                // Append when new values arrive
                lineData.Append(newValues.XValues, newValues.YValues);
                // Zoom the chart to fit
                lineData.InvalidateParentSurface(RangeMode.ZoomToFit);
            });
        }