Why does my pie chart turn into a bar chart?

[Douglas]

I have this chart in my xaml:

<control:RadChart MaxHeight="200" MaxWidth="200" HorizontalAlignment="Left" x:Name="Chart2">
    <control:RadChart.DefaultView>
        <chart:ChartDefaultView>
            <!--ChartArea-->
            <chart:ChartDefaultView.ChartArea>
                <!--ChartArea-->
                <chart:ChartArea x:Name="PieChart1">
                    <chart:ChartArea.DataSeries>
                        <chart:DataSeries>
                            <chart:DataSeries.Definition>
                                <chart:PieSeriesDefinition/>
                            </chart:DataSeries.Definition>
                            <chart:DataPoint YValue="15" />
                            <chart:DataPoint YValue="5" />
                            <chart:DataPoint YValue="34" />
                            <chart:DataPoint YValue="11" />
                            <chart:DataPoint YValue="15" />
                            <chart:DataPoint YValue="25" />
                        </chart:DataSeries>
                    </chart:ChartArea.DataSeries>
                </chart:ChartArea>
            </chart:ChartDefaultView.ChartArea>
        </chart:ChartDefaultView>
    </control:RadChart.DefaultView>
</control:RadChart>

And I have this in my code-behind:

private void LoadPieChartData(MyType myRow)
{
    if (myRow != null)
    {
        List<double> pieList = new List<double>();
        pieList.Add(myRow.Col1);
        pieList.Add(myRow.Col2);
        pieList.Add(myRow.Col3);
       Chart2.ItemsSource = pieList;
    }
}

But when LoadPieChartData is called my piechart becomes a barchart.  What did I do?

[Vladimir Milev]

Hi,

RadChart does not support databinding and manual series population at the same time. When you set its ItemsSource property it clears any series currently present (the one you have added through the XAML) and will populate with new databound series based on the DefaultSeriesDefinition of RadChart. I see you have not set that and it by default is BarSeries so you get a bar series in the end.

If you whish to databind a pie series please set the DefaultSeriesDefinition property of RadChart.

All the best,
Vladimir Milev
the Telerik team

[Douglas]

Thank you for the explanation.  I understand now.