Crosshair label definition template with chart values

[Flemming]

I have a RadCartesianChart with a DateTimeContinuousAxis and a ChartCrosshairBehavior.

When the vertical line label shows – it displays the date/time. I want to display other data from the chart too – but even when I use a template for the label definition – the only DataContext I can access is the datetime. 

Is there a way to customize the label definition - to include data from other sources? 

/Flemming Rosenbrandt

 

[Martin Ivanov]

Hi Flemming,

Indeed, the labels of the crosshair know only about the value on the axis that corresponds to the mouse position. In order to get other data from the view model of the chart itself you can use RelativeSource or ElementName binding.

<telerik:ChartCrosshairBehavior.VerticalLineLabelDefinition>
    <telerik:ChartAnnotationLabelDefinition>
        <telerik:ChartAnnotationLabelDefinition.Template>
            <DataTemplate>
                <TextBlock Text="{Binding ElementName=chart, Path=DataContext.MyAdditionalInformation}" />
            </DataTemplate>
        </telerik:ChartAnnotationLabelDefinition.Template>
    </telerik:ChartAnnotationLabelDefinition>
</telerik:ChartCrosshairBehavior.VerticalLineLabelDefinition>

Regards,
Martin
Telerik by Progress

[Flemming]

Thanks - I will give it a try.