private void AddSeries(int index, ILineSeries series)
        {
            AbstractLineSeriesCanvas canvas = CreateCanvas(series);

            canvas.Width  = ActualWidth;
            canvas.Height = ActualHeight;
            _seriesCanvasses.Insert(index, canvas);
        }
        private void RemoveSeries(ILineSeries series)
        {
            AbstractLineSeriesCanvas canvas = _seriesCanvasses.FirstOrDefault(x => x.Series == series);

            if (canvas != null)
            {
                _seriesCanvasses.Remove(canvas);
            }
        }