Exception on popup

[Christie Admin]

Hi,

I use version 2015.1.225.40 of Telerik and the Office 2013 theme. In the popup of the AutoCompleteBox control, I implement a grouping logic in the popup so for each group, I use an expander to expand/collapse a group. When I click multiple time on the arrow to expand/collapse a group, my application raise an exception:

 

2015-10-13 14:14:25,132 [9] FATAL AppointmentWpfClient.App [(null)] - An unhandled exception was intercepted. Exception message : Impossible de trouver le nom 'FocusVisual' dans la portée de nom de 'System.Windows.Controls.Grid'., Exception stacktrace :    à System.Windows.Media.Animation.Storyboard.ResolveTargetName(String targetName, INameScope nameScope, DependencyObject element)
   à System.Windows.Media.Animation.Storyboard.ClockTreeWalkRecursive(Clock currentClock, DependencyObject containingObject, INameScope nameScope, DependencyObject parentObject, String parentObjectName, PropertyPath parentPropertyPath, HandoffBehavior handoffBehavior, HybridDictionary clockMappings, Int64 layer)
   à System.Windows.Media.Animation.Storyboard.ClockTreeWalkRecursive(Clock currentClock, DependencyObject containingObject, INameScope nameScope, DependencyObject parentObject, String parentObjectName, PropertyPath parentPropertyPath, HandoffBehavior handoffBehavior, HybridDictionary clockMappings, Int64 layer)
   à System.Windows.Media.Animation.Storyboard.BeginCommon(DependencyObject containingObject, INameScope nameScope, HandoffBehavior handoffBehavior, Boolean isControllable, Int64 layer)
   à System.Windows.VisualStateGroup.StartNewThenStopOld(FrameworkElement element, Storyboard[] newStoryboards)
   à System.Windows.VisualStateManager.GoToStateInternal(FrameworkElement control, FrameworkElement stateGroupsRoot, VisualStateGroup group, VisualState state, Boolean useTransitions)
   à System.Windows.VisualStateManager.GoToStateCommon(FrameworkElement control, FrameworkElement stateGroupsRoot, String stateName, Boolean useTransitions)
   à Telerik.Windows.Controls.Primitives.ListItem.GoToState(Boolean useTransitions, String[] stateNames)
   à Telerik.Windows.Controls.RadListBoxItem.ChangeVisualState(Boolean useTransitions)
   à Telerik.Windows.Controls.Primitives.ListItem.OnMouseLeave(MouseEventArgs e)
   à Telerik.Windows.Controls.RadListBoxItem.OnMouseLeave(MouseEventArgs e)
   à System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   à System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   à System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   à System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   à System.Windows.ReverseInheritProperty.FirePropertyChangeInAncestry(DependencyObject element, Boolean oldValue, DeferredElementTreeState treeState, Action`2 originChangedAction)
   à System.Windows.ReverseInheritProperty.FirePropertyChangeInAncestry(DependencyObject element, Boolean oldValue, DeferredElementTreeState treeState, Action`2 originChangedAction)
   à System.Windows.ReverseInheritProperty.FirePropertyChangeInAncestry(DependencyObject element, Boolean oldValue, DeferredElementTreeState treeState, Action`2 originChangedAction)
   à System.Windows.ReverseInheritProperty.FirePropertyChangeInAncestry(DependencyObject element, Boolean oldValue, DeferredElementTreeState treeState, Action`2 originChangedAction)
   à System.Windows.ReverseInheritProperty.FirePropertyChangeInAncestry(DependencyObject element, Boolean oldValue, DeferredElementTreeState treeState, Action`2 originChangedAction)
   à System.Windows.ReverseInheritProperty.FirePropertyChangeInAncestry(DependencyObject element, Boolean oldValue, DeferredElementTreeState treeState, Action`2 originChangedAction)
   à System.Windows.ReverseInheritProperty.OnOriginValueChanged(DependencyObject oldOrigin, DependencyObject newOrigin, IList`1 otherOrigins, DeferredElementTreeState& oldTreeState, Action`2 originChangedAction)
   à System.Windows.Input.MouseDevice.ChangeMouseOver(IInputElement mouseOver, Int32 timestamp)
   à System.Windows.Input.MouseDevice.PreNotifyInput(Object sender, NotifyInputEventArgs e)
   à System.Windows.Input.InputManager.ProcessStagingArea()
   à System.Windows.Input.MouseDevice.Synchronize()
   à System.Windows.Input.MouseDevice.PostProcessInput(Object sender, ProcessInputEventArgs e)
   à System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
   à System.Windows.Input.InputManager.ProcessStagingArea()
   à System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   à System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   à System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   à System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   à MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   à MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   à System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   à System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler), Inner Exception message : , Inner Exception StackTrace : 

Thank's

Alain

[Nasko]

Hi Alain,

In its current implementation RadAutoCompleteBox does not provide support for grouping out of the box. Implementing such functionality could cause some unexpected behavior of the control which is not supported. That functionality is currently out of the scope of the control.

However, instead of using an Expander we came up with an another approach that demonstrates how to achieve a similar to the desired functionality and hierarchical appearance using grouping and custom FilteringBehavior. Please, check the attached sample project that demonstrates it.

Hope this helps.

Regards,
Nasko
Telerik