error using 3DSeriesDefinition with DataSeries

[Brian Graves]

I'm  getting the following error when attempting to  use Line3DSeriesDefinition (doesn't occur when using LineSeriesDefinition) for my DataSeries Definition:
Error: Unhandled Error in Silverlight Application
Code: 4004   
Category: ManagedRuntimeError      
Message: System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.Windows.Controls.Charting.ChartArea.ClearLogicalChildren()
   at Telerik.Windows.Controls.Charting.ChartArea.PopulateLogicalChildren()
   at Telerik.Windows.Controls.Charting.ChartArea.OnApplyTemplate()
   at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)    

I'm using the lastest SP of Telerik version 3 (not able to update to version 4 without VS2010).  The examples I've seen use SeriesMapping for 3D but I want to use DataSeries like I do with 2D...is this possible?  Here's my code:

            chartReport.DefaultView.ChartArea.DataSeries.Clear();
            chartReport.DefaultView.ChartArea.ItemClick += RadChart1ChartItemClicked;

            if (chartReport.DefaultView.ChartArea.AdditionalYAxes.Count > 0)
            {
                chartReport.DefaultView.ChartArea.AdditionalYAxes[0].AxisName = _rs.ChartSecondaryYAxis;
            }
            else
            {
                AxisY series2Axis = new AxisY();
                series2Axis.AxisName = _rs.ChartSecondaryYAxis;
                chartReport.DefaultView.ChartArea.AdditionalYAxes.Add(series2Axis);
            }

            chartReport.DefaultView.ChartTitle.Visibility = Visibility.Collapsed;
            chartReport.DefaultView.ChartArea.AxisX.LabelRotationAngle = 30;
            chartReport.DefaultView.ChartArea.ZoomScrollSettingsX.ScrollMode = ScrollMode.None;
            chartReport.DefaultView.ChartArea.ZoomScrollSettingsY.ScrollMode = ScrollMode.None;
            chartReport.DefaultView.ChartArea.AxisY.AutoRange = true;

            DataSeries dataSeries1 = new DataSeries();

            if (_rs.ChartDimension.ToLower() == "3d")
                chartReport.DefaultView.ChartArea.Extensions.Add(new CameraExtension());

            if (_rs.ChartType.ToLower() == "line")
            {
                if (_rs.ChartDimension.ToLower() == "2d")
                    dataSeries1.Definition = new LineSeriesDefinition();
                else
                    dataSeries1.Definition = new Line3DSeriesDefinition();
            }
            else
            {
                if (_rs.ChartDimension.ToLower() == "2d")
                    dataSeries1.Definition = new BarSeriesDefinition();
                else
                    dataSeries1.Definition = new Bar3DSeriesDefinition();
            }

            dataSeries1.LegendLabel = _rs.ChartPrimaryYAxis;
            dataSeries1.Definition.LegendDisplayMode = LegendDisplayMode.SeriesLabel;

            DataSeries dataSeries2 = null;
            if (_rs.UseChartSecondaryYAxis)
            {
                dataSeries2 = new DataSeries();
                if (_rs.ChartType.ToLower() == "line")
                {
                    if (_rs.ChartDimension.ToLower() == "2d")
                        dataSeries2.Definition = new LineSeriesDefinition();
                    else
                        dataSeries2.Definition = new Line3DSeriesDefinition();
                }
                else
                {
                    if (_rs.ChartDimension.ToLower() == "2d")
                        dataSeries2.Definition = new BarSeriesDefinition();
                    else
                        dataSeries2.Definition = new Bar3DSeriesDefinition();
                }
                dataSeries2.Definition.AxisName = _rs.ChartSecondaryYAxis;
                dataSeries2.LegendLabel = _rs.ChartSecondaryYAxis;
                dataSeries2.Definition.LegendDisplayMode = LegendDisplayMode.SeriesLabel;
            }

            int rowNum = 0;
            foreach (object item in source)
            {
                if (rowNum == topRows)
                    break;

                string[] attributes = _rs.ChartXAxis.Split(',');
                string attributeName = "";
                foreach (string attribute in attributes)
                {
                    object name = item.GetType().GetProperty(DynamicDataBuilder.ReplaceProblematicChars(attribute)).GetValue(item, null);
                    if (attributeName.Length > 0)
                        attributeName += " | ";
                    attributeName += Convert.ToString(name);
                }
                object value = item.GetType().GetProperty(_rs.ChartPrimaryYAxis).GetValue(item, null);
                dataSeries1.Add(new DataPoint(attributeName, Convert.ToDouble(value)) { DataItem = item });

                if (_rs.UseChartSecondaryYAxis)
                {
                    value = item.GetType().GetProperty(_rs.ChartSecondaryYAxis).GetValue(item, null);
                    dataSeries2.Add(new DataPoint(attributeName, Convert.ToDouble(value)) { DataItem = item });
                }

                rowNum++;

            }

            chartReport.DefaultView.ChartArea.DataSeries.Add(dataSeries1);
            if (dataSeries2 != null)
                chartReport.DefaultView.ChartArea.DataSeries.Add(dataSeries2);
            chartReport.Width = rowNum * 80 + 300;
            chartReport.DefaultView.ChartArea.AxisX.AxisStyles.ItemLabelStyle = LayoutRoot.Resources["AxisXStyleTextBlock"] as Style;

This works perfectly for 2D, but it looks like I can't simply use the 3D series definition class in place of the regular series definition class.  The example shown here adds the CameraExtension (which I've also coded...getting the same error) but this is the only  major difference I can see (maybe something is being left out here):
http://demos.telerik.com/silverlight/#Chart/Gallery3D/Line

Is there a better (working) example that I can use that implements either the Line3DSeriesDefinition or the Bar3DSeriesDefinition classes with the DataSeries?

[Nikolay]

Hello Brian Graves,

Please, find attached a sample application, which utilizes Line3DSeriesDefinition and works as expected on our side. Let me note that ZoomScrollSettings and RadChart1ChartItemClicked event would not work with 3D series, however, neither of them should be causing the error you've encountered.

Please, have a look at the application and if you continue experiencing the same problem, we'd kindly ask you to modify it, so that the issue is reproducible for our developers to look into and provide timely resolution.

Kind regards,
Nikolay
the Telerik team