Hello,

from time to time we get an unhandled exception from the DockManager telling that "A deffered show is already in progress".

What is the reason for this exception and how can it be fixed?

Here is the call stack:

[Window Title]

An unhandled exception has occured.

[Content]

System.InvalidOperationException: A deferred show is already in progress.

   at Infragistics.Windows.Controls.ToolWindow.ShowImpl(FrameworkElement owner)

   at Infragistics.Windows.Controls.ToolWindow.ShowAsync(FrameworkElement owner, Boolean activate, Boolean preferPopup)

   at Infragistics.Windows.DockManager.DockManagerUtilities.ShowToolWindow(ToolWindow window, FrameworkElement owner, Boolean activate)

   at Infragistics.Windows.DockManager.PaneToolWindow.ShowHelper()

   at Infragistics.Windows.DockManager.PaneToolWindow.set_IsWindowLoaded(Boolean value)

   at Infragistics.Windows.DockManager.XamDockManager.SetIsWindowLoaded(PaneToolWindow window, Boolean loaded)

   at Infragistics.Windows.DockManager.XamDockManager.SetIsWindowLoaded(Boolean loaded)

   at Infragistics.Windows.DockManager.XamDockManager.VerifyFloatingWindowVisibility()

   at Infragistics.Windows.DockManager.XamDockManager.OnDockManagerLoaded(Object sender, RoutedEventArgs e)

   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)

   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)

   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)

   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)

   at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)

   at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)

   at MS.Internal.LoadedOrUnloadedOperation.DoWork()

   at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()

   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()

   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)

   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)

   at System.Windows.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget)

   at System.Windows.Interop.HwndTarget.OnResize()

   at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)

   at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)

   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)