Vista - Bug report: Closing a Window with a WindowsFormsHost causes excep

This behavior is observed with the February CTP:

DESCRIPTION:
I have a Window with a WindowsFormsHost on it that is hosting a
System.Windows.Forms.TextBox. Closing the window via an invokation causes an
System.ComponentModel.Win32Exception: "Invalid Window Handle." Closing the
window directly (using the Close button on the title bar) does not trigger
the exception.

STACK TRACE:
at System.Windows.Interop.HwndHost.BuildOrReparentWindow()
at System.Windows.Interop.HwndHost.OnSourceChanged(Object sender,
SourceChangedEventArgs e)
at System.Windows.SourceChangedEventArgs.InvokeEventHandler(Delegate
genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object
target)
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(RoutedEventArgs args)
at
System.Windows.PresentationSource.UpdateSourceOfElement(DependencyObject
doTarget, DependencyObject doAncestor, DependencyObject doOldParent)
at System.Windows.PresentationSource.RootChanged(Visual oldRoot, Visual
newRoot)
at System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value)
at System.Windows.Interop.HwndSource.set_RootVisual(Visual value)
at System.Windows.Window.SourceWindowHelper.ClearRootVisual()
at System.Windows.Window.ClearRootVisual()
at System.Windows.Window.CloseWindowFromWmClose()
at System.Windows.Window.WmClose()
at System.Windows.Window.WindowFilterMessage(IntPtr hwnd, Int32 msg,
IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.PublicHooksFilterMessage(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, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source,
Delegate callback, Object args, Boolean isSingleParameter, Delegate
catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority
priority, TimeSpan timeout, Delegate method, Object args, Boolean
isSingleParameter)
at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority
priority, Delegate method, Object arg)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr
wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.UnsafeSendMessage(IntPtr hWnd, Int32 msg,
IntPtr wParam, IntPtr lParam)
at System.Windows.Window.InternalClose(Boolean shutdown, Boolean
ignoreCancel)
at System.Windows.Window.Close()
at
LoginScreen.LoginScreen.<>c__DisplayClass7.<ProtocolConnectionComplete>b__6()
in C:\bs_svn\shaim\src\plugins\ui\LoginScreen\LoginScreen.xaml.cs:line 304


WORKAROUND:
Calling Dispose() on the WindowsFormsHost prior to calling Close() on the
window appears to work around the problem.