Sort series in the legend

Allow me to start with stating everything works beautifully without trying to sort my legend. See attached.

However; sorting the legend has been a problem. I created a LegendDataConverter class (IValueConverter) which felt like the appropriate method to achieve a sorted legend, but all I have managed to do is cause the Legend to stop working. I.e. an empty legend.

My SciChart instance uses a custom LegendModifier. Each series in my chart is a custom class derived from “IRenderableSeriesViewModel”, named “CustomLineRenderableSeriesViewModel”. There are several bindable properties in my derived class. These properties are used in XAML to customize the multiple series displayed.

My intent is to use those same properties in the Legend converter class to sort the items displayed in the legend. I’ve gone through several iterations of changes and have still not been successful. Here is the latest implementation, which does not provide appropriate results.

    public class LegendDataConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is ChartDataObject)
        {
            IEnumerable<SeriesInfo> seriesInfo = (value as ChartDataObject).SeriesInfo;

            // Extract the RenderableSeries from SeriesInfo
            var renderableSeries = seriesInfo.Select(si => si.RenderableSeries).OfType<IRenderableSeries>().ToList();

            // Separate the series based on the custom properties
            var passingLineSeries = renderableSeries.FirstOrDefault(rs =>
                ((CustomLineRenderableSeriesViewModel)rs.DataContext).IsPassingLine &&
                ((CustomLineRenderableSeriesViewModel)rs.DataContext).IsSecondAxis);

            var secondaryAxisSeries = renderableSeries.FirstOrDefault(rs =>
                !((CustomLineRenderableSeriesViewModel)rs.DataContext).IsPassingLine &&
                ((CustomLineRenderableSeriesViewModel)rs.DataContext).IsSecondAxis);

            var otherSeries = renderableSeries.Where(rs =>
                !((CustomLineRenderableSeriesViewModel)rs.DataContext).IsSecondAxis).ToList();

            // Create the ordered list
            ObservableCollection<IRenderableSeriesViewModel> ordered = new ObservableCollection<IRenderableSeriesViewModel>();
            otherSeries.ForEach(s => ordered.Add((CustomLineRenderableSeriesViewModel)s.DataContext));
            if (secondaryAxisSeries != null)
            {
                ordered.Add((CustomLineRenderableSeriesViewModel)secondaryAxisSeries.DataContext);
            }
            if (passingLineSeries != null)
            {
                ordered.Add((CustomLineRenderableSeriesViewModel)passingLineSeries.DataContext);
            }

            return ordered;
        }

        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

I welcome any suggestions.