I didn't encounter this myself. Instead, I saw it in our application logs. We're using the Q1 2013 controls with the Windows 8 theme.
Any ideas?
System.InvalidOperationException: 4009 An error has occurred.
at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
at MS.Internal.XcpImports.Collection_AddValue[T](PresentationFrameworkCollection`1 collection, CValue value)
at MS.Internal.XcpImports.Collection_AddDependencyObject[T](PresentationFrameworkCollection`1 collection, DependencyObject value)
at System.Windows.PresentationFrameworkCollection`1.AddDependencyObject(DependencyObject value)
at System.Windows.Controls.UIElementCollection.AddInternal(UIElement value)
at Telerik.Windows.Controls.RichTextBoxUI.DocumentRulerBase.ShowRulerThumbMarker(RulerThumb indent)
at Telerik.Windows.Controls.RichTextBoxUI.DocumentRulerBase.TabStopThumb_DragStarted(Object sender, DragStartedEventArgs e)
at Telerik.Windows.Controls.RichTextBoxUI.RulerThumb.StartDragging(Point origin)
at Telerik.Windows.Controls.RichTextBoxUI.RulerThumb.OnMouseLeftButtonDown(MouseButtonEventArgs e)
at System.Windows.Controls.Control.OnMouseLeftButtonDown(Control ctrl, EventArgs e)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags) 0 Silverlight AppDomain
Any ideas?
System.InvalidOperationException: 4009 An error has occurred.
at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
at MS.Internal.XcpImports.Collection_AddValue[T](PresentationFrameworkCollection`1 collection, CValue value)
at MS.Internal.XcpImports.Collection_AddDependencyObject[T](PresentationFrameworkCollection`1 collection, DependencyObject value)
at System.Windows.PresentationFrameworkCollection`1.AddDependencyObject(DependencyObject value)
at System.Windows.Controls.UIElementCollection.AddInternal(UIElement value)
at Telerik.Windows.Controls.RichTextBoxUI.DocumentRulerBase.ShowRulerThumbMarker(RulerThumb indent)
at Telerik.Windows.Controls.RichTextBoxUI.DocumentRulerBase.TabStopThumb_DragStarted(Object sender, DragStartedEventArgs e)
at Telerik.Windows.Controls.RichTextBoxUI.RulerThumb.StartDragging(Point origin)
at Telerik.Windows.Controls.RichTextBoxUI.RulerThumb.OnMouseLeftButtonDown(MouseButtonEventArgs e)
at System.Windows.Controls.Control.OnMouseLeftButtonDown(Control ctrl, EventArgs e)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags) 0 Silverlight AppDomain