Chrome Glass Border - Drag'n Drop Problem | GUI: WPF und Silverlight

Hallo zusammen

Ich hab wieder ein Problem mit dem Glass Border.
Wenn ich bei meiner Applikation folgenden style Lade:

XML-Code:

<Style TargetType="{x:Type ribbon:Ribbon}">

        <Setter Property="Background" Value="Transparent"></Setter>

    </Style>

    <Style TargetType="{x:Type v:Shell}">

        <Setter Property="shell:WindowChrome.WindowChrome">

            <Setter.Value>

                <shell:WindowChrome CornerRadius="0" ResizeBorderThickness="10" GlassFrameThickness="-1" CaptionHeight="30"></shell:WindowChrome>

            </Setter.Value>

        </Setter>

        <Setter Property="Template" Value="{DynamicResource ChromeWindowContent}"></Setter>

    </Style>

    <ControlTemplate TargetType="{x:Type v:Shell}" x:Key="ChromeWindowContent">

        <Grid>

            <ContentPresenter x:Name="content" Margin="3,8,3,3" Content="{TemplateBinding Content}" ></ContentPresenter>

        </Grid>

        <ControlTemplate.Triggers>

            <Trigger Property="WindowState" Value="Maximized">

                <Setter Property="Margin" Value="8,8,8,8" TargetName="content"></Setter>

            </Trigger>

        </ControlTemplate.Triggers>

    </ControlTemplate>

Enden All Drag'n Drop Aktionen mit einem Exception.
Zb. der Versucht ein GridSplitter zu verschieben:

Fehlermeldung:

System.NullReferenceException was unhandled
Message=Object reference not set to an instance of an object.
Source=PresentationFramework
StackTrace:
at System.Windows.Controls.GridSplitter.OnDragDelta(DragDeltaEventArgs e)
at System.Windows.Controls.GridSplitter.OnDragDelta(Object sender, DragDeltaEventArgs e)
at System.Windows.Controls.Primitives.DragDeltaEventArgs.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(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
at System.Windows.Controls.Primitives.Thumb.OnMouseMove(MouseEventArgs e)
at System.Windows.UIElement.OnMouseMoveThunk(Object sender, MouseEventArgs e)
at System.Windows.Input.MouseEventArgs.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(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
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)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at ChromeRibbon.App.Main() in c:\Project\CSharp\WPF\ChromeRibbon\ChromeRibbon\obj\x86\Debug\App.g.cs:line 0
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:

...Ohne Glass Efekt funktionieren alle Drag'nDrop Aktionen.

Wenn ich den Style nicht lade, funktionieren alles wunderbar.
Mein OS ist Win7 x64.

Mfg.
Musiumincapitiss