Maybe this is already known? In IPyTools CTP2:
Create new WPF IPY app; add a button; in Button XAML, add MouseEnter="" Result: a good chance at this point the unhandled exception will have occurred. If not, this is a 100% occurrence at the next step: enter text between the empty double-quotes after MouseEnter= Pressing the Click here to reload the designer link refreshes the designer OK Here's the stack trace: Server stack trace: at MS.Internal.Providers.VSAssemblyReferenceProvider.AddReference(AssemblyName newReference) at MS.Internal.Host.Isolation.Adapters.ContextToProtocolAdapter.MS.Internal.Host.Isolation.Protocols.IAssemblyReferenceProtocol.AddReference(AssemblyName name) at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at MS.Internal.Host.Isolation.Protocols.IAssemblyReferenceProtocol.AddReference(AssemblyName name) at MS.Internal.Host.Isolation.Adapters.ToAssemblyReferenceAdapter.AddReference(AssemblyName newReference) at MS.Internal.Host.PersistenceSubsystem.ReconcileReferences(AssemblyReferences references) at MS.Internal.Host.PersistenceSubsystem.<Load>b__8(AssemblyReferences newReferences) at Microsoft.Windows.Design.ContextItemManager.SubscribeProxy`1.SubscribeContext(ContextItem item) at Microsoft.Windows.Design.SubscribeContextCallback.Invoke(ContextItem item) at Microsoft.Windows.Design.EditingContext.DefaultContextItemManager.OnItemChanged(ContextItem item) at Microsoft.Windows.Design.EditingContext.DefaultContextItemManager.SetValue(ContextItem value) at Microsoft.Windows.Design.DocumentModel.MarkupDocumentManagerBase.EnsureAssemblyReference(IAssemblyMetadata assembly) at Microsoft.Windows.Design.DocumentModel.MarkupDocumentManagerBase.ReferenceUpdater.EnsureReferences(IEnumerable`1 types) at Microsoft.Windows.Design.DocumentModel.MarkupDocumentManagerBase.ReferenceUpdater.Microsoft.Windows.Design.DocumentModel.IDocumentTreeConsumer.HandleMessage(DocumentTreeCoordinator sender, MessageKey key, MessageArguments args) at Microsoft.Windows.Design.DocumentModel.MarkupDocumentManagerBase.CancelableDocumentTreeCoordinator.RouteMessage[T](IDocumentTreeConsumer consumer, MessageKey`1 key, T args) at Microsoft.Windows.Design.DocumentModel.DocumentTreeCoordinator.SendMessage[T](MessageKey`1 key, T args, Boolean isPrivateMessage) at Microsoft.Windows.Design.DocumentModel.DocumentTreeCoordinator.SendMessage[T](MessageKey`1 key, T args) at Microsoft.Windows.Design.DocumentModel.DocumentTreeCoordinator.ReportDamage(IDocumentTreeProducer tree, Damage damage) at Microsoft.Windows.Design.DocumentModel.MarkupProducer.Update() at Microsoft.Windows.Design.DocumentModel.MarkupProducer.HandleMessage(DocumentTreeCoordinator sender, MessageKey key, MessageArguments args) at Microsoft.Windows.Design.DocumentModel.MarkupProducer.Microsoft.Windows.Design.DocumentModel.IDocumentTreeConsumer.HandleMessage(DocumentTreeCoordinator sender, MessageKey key, MessageArguments args) at Microsoft.Windows.Design.DocumentModel.DocumentTreeCoordinator.SendMessage[T](MessageKey`1 key, T args, Boolean isPrivateMessage) at Microsoft.Windows.Design.DocumentModel.DocumentTreeCoordinator.QueuedMessage`1.Microsoft.Windows.Design.DocumentModel.IQueuedMessage.Invoke() at Microsoft.Windows.Design.DocumentModel.DocumentTreeCoordinator.ProcessQueuedMessages(Object state) 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)
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