InvalidOperationException: Children collection already observed.
StackTrace:
   在 PropertyTools.Wpf.TreeListBox.InsertItem(Int32 index, Object item, Object parent)
   在 PropertyTools.Wpf.TreeListBox.InsertItems(Object parent, IList newItems, Int32 newStartingIndex)
   在 PropertyTools.Wpf.TreeListBox.ChildCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   在 System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   在 System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   在 System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
   在 IntelliTools.Domain.Favorite.FavorItemDatabase.MoveTo(FavorItem item, FavorItem target, Int32 newIndex)
   在 IntelliTools.Domain.Favorite.FavorItemHelper.MoveTo(FavorItem item, FavorItem target, Int32 index)
   在 IntelliTools.Domain.Favorite.FavorItemDatabase.Restore(FavorItem item)
   在 System.Collections.Generic.List`1.ForEach(Action`1 action)
   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)