ArgumentException when Dragging Multiple ToolWindows

Hi,

when dragging multiple toolwindows to the Workspace an Exception is thrown:

System.ArgumentException: The TabbedMdiHost cannot open the window 'Toolwindow 1' because it is already open elsewhere.

StackTrace:
bei ActiproSoftware.Windows.Controls.Docking.TabbedMdiHost.b(DockingWindow A_0)
bei ActiproSoftware.Windows.Controls.Docking.TabbedMdiHost.ActiproSoftware.Windows.Controls.Docking.IMdiHost.Open(DockingWindow window)
bei ActiproSoftware.Windows.Controls.Docking.DockSite.u(DependencyObject A_0)
bei ActiproSoftware.Windows.Controls.Docking.DockSite.e(DependencyObject A_0, DependencyObject A_1, Direction A_2)
bei ActiproSoftware.Windows.Controls.Docking.DockSite.a(DependencyObject A_0, IDockTarget A_1, Direction A_2)
bei ActiproSoftware.Windows.Controls.Docking.Primitives.RaftableDockingWindowContainer.OnPreviewWindowExitMove(Object A_0, DockingPreviewEventArgs A_1)
bei ActiproSoftware.Windows.Controls.Docking.Preview.PreviewWindow.StopPreview(DockingPreviewEventArgs A_0)
bei ActiproSoftware.Windows.Controls.Docking.Preview.PreviewWindow.OnMouseUp(Object A_0, MouseButtonEventArgs A_1)
bei System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
bei System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
bei System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
bei System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
bei System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
bei System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
bei System.Windows.Input.InputManager.ProcessStagingArea()
bei System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
bei System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
bei System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
bei System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
bei System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
bei MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
bei MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
bei System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
bei System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
bei System.Windows.Application.RunDispatcher(Object ignore)
bei System.Windows.Application.RunInternal(Window window)
bei System.Windows.Application.Run(Window window)
bei System.Windows.Application.Run()
bei WpfApplication1.App.Main() in c:\users\prochnow\documents\visual studio 2010\Projects\WpfApplication1\WpfApplication1\obj\x86\Debug\App.g.cs:Zeile 0.
bei System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
bei System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
bei Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
bei System.Threading.ThreadHelper.ThreadStart_Context(Object state)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bei System.Threading.ThreadHelper.ThreadStart()

Reproducing the bug:

Create and run a MainWindow with the following xaml:

<Window
x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:docking="clr-namespace:ActiproSoftware.Windows.Controls.Docking;assembly=ActiproSoftware.Docking.Wpf351"
Title="MainWindow"
Height="350"
Width="525"
>
<docking:DockSite>
<docking:SplitContainer>
<docking:Workspace>
<docking:TabbedMdiHost />
</docking:Workspace>
<docking:ToolWindowContainer>
<docking:ToolWindow Title="Toolwindow 1">
</docking:ToolWindow>
<docking:ToolWindow Title="Toolwindow 2">
</docking:ToolWindow>
</docking:ToolWindowContainer>
</docking:SplitContainer>
</docking:DockSite>
</Window>


Try to dock the ToolWindows into the Workspace.
The exception only occurs when multiple ToolWindows are dragged.


Best regards,

Christian Prochnow

[Modified at 01/18/2011 02:06 AM]