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Here’s the situation:
Our app has a viewmodel with an XyDataSeries Property bound to the plot. We’ve overridden DataPointSelectionModifer to allow us to trigger calculations when the selected points are changed. This overridden modifier is not instantiated by nor is it directly aware of the viewmodel; it is referenced only in the view xaml.

When changing between datasets we replace the contents of the XyDataSeries Property. Afterwards we are experiencing NullReferenceExceptions in DataPointSelectionModifier.SelectManyPoints(). This occurs whether we replace the contents of the data series or we set a completely new XyDataSeries object into the property.

It appears that the DataPointSelectionModifier.SelectedPointMarkers collection is no longer properly synced to the plot’s XyDataSeries. The size of the the collections are different and with the original DataSeries being garbage-collected the DataPointInfo.DataPointMetadata references are null. So we attempt to dial in a new selection and the deselection of this orphaned null metadata raises exceptions.

Is there some secret-sauce to keeping these collections in line?
Any and all suggestions are greatly appreciated.

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