NullreferenceExcepting after changing VirtualizationStrategyDefinition

[Victor]

 Hi,

I'm dynamically changing VirtualizationStrategyDefinition and after that all items is disappeared from the list. If I make pull-to-refresh the list sometime items are come back but sometimes I`ve got this error:   

[Type]:[NullReferenceException]
[ExceptionMessage]:[Object reference not set to an instance of an object.]
[StackTrace]:[
   at Telerik.Windows.Controls.RadDataBoundListBox.IsFirstItemFirstInListSource()
   at Telerik.Windows.Controls.RadVirtualizingDataControl.OnVerticalCompressionStates_StateChanging(Object sender, VisualStateChangedEventArgs e)
   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)]
[InnerException]:[none]​

 

Im changing it in this way:

VirtualizationStrategyDefinition str = new WrapVirtualizationStrategyDefinition();
str.Orientation = System.Windows.Controls.Orientation.Horizontal;
radDataBoundListBox.VirtualizationStrategyDefinition = str;
radDataBoundListBox.ItemTemplate = (DataTemplate)((MainPage)sender).Resources["DataWarpTemplate1"];​​

Does anybody know how to fix this?

 

Victor

[Rosy Topchiyska]

Hi Victor,

Thank you for contacting us.

There seems to be a problem when you change the VirtualizationStrategyDefinition runtime. We will investigate the issue. Until a fix is available, as a workaround I can suggest to create a new DataBoundListBox each time the VirtualizationStrategyDefinition is changed.

Thank you for bringing this issue to our attention. I have updater your Telerik points accordingly.

Regards,
Rosy Topchiyska
Telerik