Error to create clone of Chart Control

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WPF

clone

chart

hi Everyone,
I have one serious problem,
if you have any solution please let me know.

I have one WPF bar chart.
I am creating this using below function.

public Chart createwpfbar(Chart wpfbar)
        {
            DataPointSeries datapointseries = new ColumnSeries();
            datapointseries.Title = "Quantity";
            List<keyvaluepair><string,>> valueList = new List<keyvaluepair><string,>>();
            valueList.Add(new KeyValuePair<string,>("Developer", 60));
            valueList.Add(new KeyValuePair<string,>("Misc", 20));
            valueList.Add(new KeyValuePair<string,>("Tester", 50));
            valueList.Add(new KeyValuePair<string,>("QA", 30));
            valueList.Add(new KeyValuePair<string,>("Project Manager", 40));
            ChartLegendItem item1 = new ChartLegendItem();
            item1.MarkerFill = Brushes.YellowGreen;
            item1.Label = "Volts";
            ChartDefaultView chartdefaultview = new ChartDefaultView();
            chartdefaultview.ChartLegend.Items.Add(item1);
            chartdefaultview.ChartTitle.HorizontalAlignment = HorizontalAlignment.Center;
            BarSeries newbarseries = new BarSeries();
            newbarseries.Title = "Volts";
            newbarseries.Title = Brushes.Red;
            datapointseries.DependentValueBinding = new Binding("Value");
            datapointseries.IndependentValueBinding = new Binding("Label");
            wpfbar.DataContext = valueList;
            return wpfbar;
        }

this function returns the WPF Bar chart.
after that for some reasons I am doing clone of Chart using below code.

string GridXAML = XamlWriter.Save(element);
StringReader stringReader = new StringReader(GridXAML);
XmlReader xmlReader = XmlReader.Create(stringReader);
UIElement newGrid = (UIElement)XamlReader.Load(xmlReader);
ClipBoard.PushData(newGrid, element);

in this code I got one error for serialization,
error as follows,
Cannot serialize a non-public type 'System.Windows.Controls.DataVisualization.UniqueObservableCollection`1[System.Windows.Controls.DataVisualization.Charting.IAxis]'.

please help me as I am stucked with this error.

let me know if any solution for this.

Best Regards,
Amol P.Patil