Sparkline Throwing Exception When Bound to Entity Framework Data

[Dana]

I have a sparkline bound to an observable collection created from entity framework data

Y values used are a nullable double.

All works fine until a bound value is changed.

If value is say 12.5 and set to 14.7, works ok, spakline is updated
however
If value is changed from 12.5 to null and exception is thown - stack trace below

   at Telerik.Windows.Controls.Sparklines.DataPointsCollectionView.OnItemPropertyChanged(Object sender, PropertyChangedEventArgs e) in c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\DataVisualization\Sparklines\Data\DataPointsCollectionView.cs:line 251
   at System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e)
   at System.Data.Objects.DataClasses.StructuralObject.OnPropertyChanged(String property)
   at System.Data.Objects.DataClasses.EntityObject.ReportPropertyChanged(String property)
   at RatifTest2.Data.SampleData.set_NO(Nullable`1 value) in C:\DEV\AQ Modernisation\RatifTest2\RatifTest2\Data\RatModel.Designer.cs:line 220

If the sparkline is taken out of the equation and the data bound to say a RadGridView, setting value to null is handled correctly

[Vladimir Milev]

Hi Dana,

Sparklines support nullable values and have the "empty values" feature. We tried to reproduce the behavior you describe but to no avail. Can you please open a support ticket and attach a small runnable application illustrating the issue? Thanks!

Greetings,
Vladimir Milev
the Telerik team