private class MeasurementType1 : IDataPointProvider
    {
        public double Abscissa { get; set; }
        public double Ordinate { get; set; }
        public DateTime dateTime { get; set; }
        public BitmapImage thumbnail { get; set; }

        public MeasurementType1(double abscissa, double ordinate, BitmapImage thumb)
        {
            this.Abscissa = abscissa;
            this.Ordinate = ordinate;
            this.dateTime = DateTimeAxis.ToDateTime(abscissa);
            this.thumbnail = thumb;
        }

        public DataPoint GetDataPoint()
        {
            return new DataPoint(Abscissa, Ordinate);
        }
    }

List<MeasurementType1> itemsSource = new List<MeasurementType1>();

LineSeries m_series1 = new LineSeries();
m_series1.ItemsSource = itemsSource;