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ChartSelectionBehavior SelectionChanged
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Andrew
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Andrew asked on 20 Jan 2014, 10:40 AM
A few months ago I created a boxplot chart using a slightly modified version of the method outlined here: http://www.telerik.com/help/wpf/radchart-howto-create-scatter-errorbars-and-boxplot-series.html

I added the following to the chart's XAML: 

<telerik:RadCartesianChart.Behaviors>
   <telerik:ChartPanAndZoomBehavior ZoomMode="Vertical" PanMode="Vertical"/>
   <telerik:ChartSelectionBehavior DataPointSelectionMode="Single" />
   <telerik:ChartSelectionBehavior SelectionChanged="SelectionChanged" />
</telerik:RadCartesianChart.Behaviors>
At the time this worked perfectly and the SelectionChanged event fired and executed as I wanted. 

While revisiting this code recently I found that the event no longer fires and I've spent quite some time looking through my own code to see if any of my changes could have caused this but have not been able to get the event firing again. However in the intervening time since this was last known to work I updated my Telerik version to 2013.3.1204.40. Are there any known issues in this version which could cause the SelectionChanged event to stop firing?

Thanks for the help,

Andy.

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Martin Ivanov
Telerik team
answered on 22 Jan 2014, 02:21 PM
Hi Andy,

The RadChartView is designed to work only with a single instance of the ChartSelectionBehvaiour and the issue is caused because you are trying to create two instances of this behavior.

This is why in order to fix this you will need to move your SelectionChanged event declaration in your first ChartSelectionBehaviour and remove the last behavior. Take a look at this sample code snippet:
<telerik:RadCartesianChart.Behaviors>
    <telerik:ChartPanAndZoomBehavior ZoomMode="Vertical" PanMode="Vertical"/>
    <telerik:ChartSelectionBehavior DataPointSelectionMode="Single" SelectionChanged="ChartSelectionBehavior_SelectionChanged" />
</telerik:RadCartesianChart.Behaviors>

Regards,
Martin Ivanov
Telerik
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Andrew
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Martin Ivanov
Telerik team
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