Touch and move above RadTreeViewItem crash application

[Jiri]

Hi I have notebook with touch sreen (win 8) and when I touch and move with my finger above RadTreeViewItem (or RadTreeView) my application crash. I do not have implemented DragAndDrop.

[Stefan]

Hello Jiri,

Thanks for your report. I tried to reproduce the described issue with a sample project including only a RadTreeView with few items, but the application didn't crash.

In order to provide you further assistance may I ask you to send us a sample project reproducing the problem?
 
Regards,
Stefan
Telerik

[Jiri]

Hi, thank you for your answer, here is my solution http://s000.tinyupload.com/?file_id=26823946829249817952

[Stefan]

Hi Jiri,

Thanks for the project. It was really helpful in resolving the issue.

I manged to reproduce the exception, which is caused by the style of the ScrollViewer you use. You need to set a x:Name of the ScrollViewer in your style (x:Name="ScrollViewer") and the exception will not be thrown again.

Regards,
Stefan
Telerik

[Jiri]

Hi,

thank you for your answer. I deleted the template for ScrolViewer (Template="{DynamicResource FavNavScrollViewer}"), but the erorr is still there. Everythime I touch a RadTreeView I get TouchHandlersController_WPF.cs not found

[Stefan]

Hello Jiri,

I didn't mean that you have to delete your ScrollViewer's style. You just have to add a x:Name=ScrollViewer in it. Which means that the ScrollViewer's style should looks like this:

<ScrollViewer Template="{DynamicResource FavNavScrollViewer}"
          BorderBrush="{TemplateBinding BorderBrush}"
          BorderThickness="{TemplateBinding BorderThickness}"
          HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
          IsTabStop="False" Margin="0" Padding="{TemplateBinding Padding}"
          VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
         CanContentScroll="True"
         x:Name="ScrollViewer">
         <ItemsPresenter/>
</ScrollViewer>

The x:Name is needed because in the code when you move your finger the RadTreeView search the ScrollViewer by his x:Name and if it is not set the ScrollViewer is null and a NullReferenceException is thrown.

Regards,
Stefan
Telerik

[Jiri]

ohhhh, I got it wrong first time :D :D thank you very much, now it works perfectly :)