Hi,

I was moving a floating window when the below exception occured. 

Our application uses multiple top-level windows in different appdomains, and a ribbon with office 2010 style backstage.

Infragistics version is currently 2013.1.

Any insights? Anything we can do to prevent it, since the affected window sometimes hangs afterward and the application must be manually terminated.

App_DispatcherUnhandledException
System.InvalidOperationException: Cannot set Visibility or call Show, ShowDialog, or WindowInteropHelper.EnsureHandle after a Window has closed.
at System.Windows.Window.CoerceVisibility(DependencyObject d, Object value)
at System.Windows.DependencyObject.ProcessCoerceValue(DependencyProperty dp, PropertyMetadata metadata, EntryIndex& entryIndex, Int32& targetIndex, EffectiveValueEntry& newEntry, EffectiveValueEntry& oldEntry, Object& oldValue, Object baseValue, Object controlValue, CoerceValueCallback coerceValueCallback, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, Boolean skipBaseValueChecks)
at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
at System.Windows.Data.BindingOperations.SetBinding(DependencyObject target, DependencyProperty dp, BindingBase binding)
at Infragistics.Windows.Controls.ToolWindowHostWindow.DeferShowHelper.Show(Boolean activate)
at Infragistics.Windows.Controls.ToolWindow.DeferredShowInfo.ProcessShow(Boolean cancel)
at Infragistics.Windows.DockManager.DockManagerUtilities.ShowToolWindow(ToolWindow window, FrameworkElement owner, Boolean activate)
at Infragistics.Windows.DockManager.Dragging.DragManager.CreateFloatingPreviewWindow(Point point, Size size)
at Infragistics.Windows.DockManager.Dragging.MoveWindowAction.PerformAction(DragManager dragManager, Boolean isPreview)
at Infragistics.Windows.DockManager.Dragging.DragManager.ProcessDragMove(IInputDeviceInfo e, Nullable`1 windowRect)
at Infragistics.Windows.DockManager.Dragging.DragManager.StartDrag(FrameworkElement element, Point mouseDownPosition, IInputDeviceInfo e, Boolean processMove, Boolean isWindowDragMode)
at Infragistics.Windows.DockManager.Dragging.DragManager.OnPendingDragElementMouseMove(Object sender, MouseEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(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)