InvalidOperationException: Children collection already observed.
StackTrace:
   在 PropertyTools.Wpf.TreeListBox.InsertItem(Int32 index, Object item, Object parent)
   在 PropertyTools.Wpf.TreeListBox.HierarchySourceChanged(DependencyPropertyChangedEventArgs e)
   在 PropertyTools.Wpf.TreeListBox.<>c.<.cctor>b__11_1(DependencyObject s, DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   在 System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   在 System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue)
   在 System.Windows.Data.BindingExpressionBase.Invalidate(Boolean isASubPropertyChange)
   在 System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange)
   在 System.Windows.Data.BindingExpression.Activate(Object item)
   在 System.Windows.Data.BindingExpression.AttachToContext(AttachAttempt attempt)
   在 System.Windows.Data.BindingExpression.MS.Internal.Data.IDataBindEngineClient.AttachToContext(Boolean lastChance)
   在 MS.Internal.Data.DataBindEngine.Task.Run(Boolean lastChance)
   在 MS.Internal.Data.DataBindEngine.Run(Object arg)
   在 System.Windows.ContextLayoutManager.fireLayoutUpdateEvent()
   在 System.Windows.ContextLayoutManager.UpdateLayout()
   在 System.Windows.Interop.HwndSource.SetLayoutSize()
   在 System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value)
   在 System.Windows.Window.SetRootVisual()
   在 System.Windows.Window.SetRootVisualAndUpdateSTC()
   在 System.Windows.Window.SetupInitialState(Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight)
   在 System.Windows.Window.CreateSourceWindow(Boolean duringShow)
   在 System.Windows.Window.ShowHelper(Object booleanBox)
   在 IntelliTools.View.Favorite.FavorItemListControl2.<>c__DisplayClass11_0.<GetItemsMenu>b__5(Object s, RoutedEventArgs e)
   在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   在 System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
   在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)