Weird Exception while applying Custom Theme.

[Ariel Ben Horesh]

Hi,
I've added to my solution a custom theme based on the summer theme.
It all works well with other controls, but when I render out a Chart control it throws an exception:

{System.Windows.ApplicationUnhandledExceptionEventArgs}
    base {System.EventArgs}: {System.Windows.ApplicationUnhandledExceptionEventArgs}
    ExceptionObject: {MS.Internal.WrappedException:  [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException:  [Line: 0 Position: 0] ---> System.InvalidOperationException: Operation is not valid due to the current state of the object.
   ב System.Windows.Duration.get_TimeSpan()
   ב Telerik.Windows.Controls.Charting.BaseChartItem2D.ConfigureLinearLabelAnimation(Storyboard storyboard)
   ב Telerik.Windows.Controls.Charting.BaseChartItem2D.ConfigureLabelAnimation(Boolean shouldApplyAnimation)
   ב Telerik.Windows.Controls.Charting.BaseChartItem2D.ShowLabel(Boolean shouldApplyAnimation)
   ב Telerik.Windows.Controls.Charting.BaseChartItem2D.ShowLabelWithAnimation()
   ב Telerik.Windows.Controls.Charting.BaseChartItem2D.OnApplyTemplate()
   ב Telerik.Windows.Controls.Charting.BasePointMarkChartItem.OnApplyTemplate()
   ב System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)

   ב MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
   ב MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name)
   ב MS.Internal.XcpImports.FrameworkElement_ApplyTemplate(FrameworkElement frameworkElement)
   ב System.Windows.Controls.ItemContainerGenerator.LayoutStatesManager.GetElementRoot(Boolean templatesAreGenerated)
   ב System.Windows.Controls.ItemContainerGenerator.LayoutStatesManager.Load()
   ב System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject container)
   ב System.Windows.Controls.ItemsControl.AddVisualChild(Int32 containerIndex, DependencyObject container, Boolean needPrepareContainer)
   ב System.Windows.Controls.ItemsControl.AddContainers()
   ב System.Windows.Controls.ItemsControl.RecreateVisualChildren(IntPtr unmanagedObj)

    Handled: false

Any ideas ? 
Thanks 
Ariel

[Sia]

Hello Ariel Ben Horesh,

When you have a custom theme applied to RadChart, there is one step in addition which needs to be done with the chart xaml. More information can be found in our help, and this help topic in particular. You need to add storyboards for your custom theme in the Chart.xaml file.

Kind regards,
Sia
the Telerik team