Chart Legend is missing

[Liberte]

Hello guys, i have that lines in my code-behind:

	public partial class MainWindow : Window
	{
	public MainWindow()
	{
	this.InitializeComponent();
	MainWindowViewModel model = new MainWindowViewModel();
	RadChart1.DefaultView.ChartArea = model.MainChartArea;
	RadChart1.DefaultView.ChartLegend.UseAutoGeneratedItems = true;
	}
	}
	public class MainWindowViewModel
	{
	private ChartArea _area;
	public ChartArea MainChartArea
	{
	get
	{
	if (_area == null)
	_area = CreateChartArea();
	return _area;
	}
	}
	private ChartArea CreateChartArea()
	{
	ChartArea area = new ChartArea();
	DataSeries ser1 = new DataSeries();
	ser1.Add(new DataPoint(23));
	ser1.Add(new DataPoint(45));
	ser1.Add(new DataPoint(33));
	ser1.Add(new DataPoint(12));
	ser1.Add(new DataPoint(50));
	ser1.LegendLabel = "Series 1 Label";
	area.DataSeries.Add(ser1);
	DataSeries ser2 = new DataSeries();
	ser2.Add(new DataPoint(45));
	ser2.Add(new DataPoint(50));
	ser2.Add(new DataPoint(60));
	ser2.Add(new DataPoint(30));
	ser2.Add(new DataPoint(25));
	ser2.LegendLabel = "Series 2 Label";
	area.DataSeries.Add(ser2);
	return area;
	}
	}

and that is the XAML part:

	<Grid x:Name="LayoutRoot">
	<control:RadChart x:Name="RadChart1">
	<control:RadChart.DefaultView>
	<chart:ChartDefaultView>
	<chart:ChartDefaultView.ChartLegend>
	<chart:ChartLegend x:Name="CustomLegend" Header="Legend Header" UseAutoGeneratedItems="True">
	</chart:ChartLegend>
	</chart:ChartDefaultView.ChartLegend>
	<chart:ChartDefaultView.ChartTitle>
	<chart:ChartTitle>
	<TextBlock Text="Declarative RadChart"/>
	</chart:ChartTitle>
	</chart:ChartDefaultView.ChartTitle>
	</chart:ChartDefaultView>
	</control:RadChart.DefaultView>
	</control:RadChart>
	</Grid>

but now... i don't have the Legend generated. So what's missing? How to get back the Legend if i use something like MVVM?

[Giuseppe]

Hi Liberte,

You need to explicitly associate the ChartArea and the ChartLegend in this scenario as you are swapping the default ChartArea instance:

public Window1()
{
    this.InitializeComponent();
    MainWindowViewModel model = new MainWindowViewModel();
    model.MainChartArea.Legend = RadChart1.DefaultView.ChartLegend;
    RadChart1.DefaultView.ChartArea = model.MainChartArea;
    RadChart1.DefaultView.ChartLegend.UseAutoGeneratedItems = true;
}

Regards,
Manuel
the Telerik team

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[Liberte]

Oh, yes .. that makes sense. Thanks :}