The TrackerControl template must contain a content container exception

Hi again,

I am using OxyPlot.WIndowsUniversal 2014.1.546.0 in a win8.1 project. I am trying to create a chart witth a category axis, a linear axis and a line series. Below is the code that creates the chart.

 var chartModel = new PlotModel();              

            CategoryAxis categAxis = new CategoryAxis();
            categAxis.Position = AxisPosition.Bottom;
            categAxis.ItemsSource = chartvm.DateValues;
            categAxis.LabelField = "MN";
            categAxis.IsTickCentered = true;
            categAxis.IsZoomEnabled = false;
            categAxis.IsPanEnabled = false;
            categAxis.MaximumPadding = 0;
            categAxis.MinimumPadding = 0;
            
            chartModel.Axes.Add(categAxis);


            LinearAxis linAxis = new LinearAxis();
            linAxis.Position = AxisPosition.Left;
            linAxis.IsPanEnabled = false;
            linAxis.IsZoomEnabled = false;
            linAxis.MaximumPadding = 0;
            linAxis.MinimumPadding = 0;
            linAxis.LabelFormatter = ((double d) => String.Format("{0:0.00€}", d));
            chartModel.Axes.Add(linAxis);          


            var series = new AreaSeries
            {
                Color = OxyColor.FromArgb(255, 78, 154, 6),
                DataFieldX2 = "OxySeriesValue",
                DataFieldY2 = "OxyZeroValue",
                DataFieldX = "OxySeriesValue",
                DataFieldY = "Value",
               
                MarkerType = MarkerType.Circle,
                MarkerSize=3,          
                MarkerFill = OxyColor.FromRgb(0, 117, 235),
                
                ItemsSource = chartvm.DateValues,
            };
            series.Color = OxyColor.FromRgb(0, 117, 235);
            series.Color2 = OxyColor.FromRgb(0, 117, 235);
                       
            chartModel.Series.Add(series);          
            
            var children = AllChildren(ChartSection);
            PlotView plotView = children[8] as PlotView;
            plotView.Model = chartModel;
            

It all works well until the tracker is required to show. Whrn that happens the following exception occurs.

System.InvalidOperationException: The TrackerControl template must contain a content container with name +'PART_ContentContainer'
at OxyPlot.WindowsUniversal.TrackerControl.OnApplyTemplate()

Does anybody know why the exception is thrown??

Thanks in advance !!