Exception clicking button to load on demand

[Steve]

The first time I click on the expander for a load on demand item, the little circle appears, but never goes away.  The LoadOnDemand event doesn't appear to fire as well.  When I click on a second on demand item I receive the following exception...

 'LoadingVisualAngleTransform' name cannot be found in the name scope of 'System.Windows.Controls.ControlTemplate'.



Here is the xaml...

<telerik:RadTreeView x:Name="ExtendedTreeView"
     ItemsSource="{Binding TreeViewItems}"
     BorderThickness="0"
     IsEditable="True"
     IsLoadOnDemandEnabled="True"
     LoadOnDemand="ExtendedTreeView_LoadOnDemand"
     telerikAnimation:AnimationManager.IsAnimationEnabled="False"
     FocusVisualStyle="{x:Null}">

[Steve]

The loading transform wasn't named in my template.  Adding the 'LoadingVisualAngleTransform' name solved the problem.

Thanks,

Steve