Npc (nuget): Helps to write expressions like:          myViewModel.Track(vm => vm.A.B.C.Name) and be sure         to get notified whenewer vm.A, or A.B, or C.Name changed.
Keywords: WPF|MVVM|reactive|track|observe|change|INotifyPropertyChange|DependencyProperty|ObservableCollection|inotifypropertychanged|mvvm|observable-collections|wpf