ChildEvents

ChildEvents.cs

    public class Passenger : ReactiveObject
    {
        public IObservable<bool> SelectedObs;
        public Passenger()
        {
            SelectedObs = this.WhenAny(x => x.IsSelected, x => x.Value);
        }
        bool _isSelected;
        public bool IsSelected
        {
            get { return _isSelected; }
            set { this.RaiseAndSetIfChanged(ref _isSelected, value); }
        }
    }
    public class MainViewModel : ReactiveObject
    {
        readonly ObservableAsPropertyHelper<List<Passenger>> passengers;
        public List<Passenger> Passengers
        {
            get { return passengers.Value; }
        }

        public MainViewModel()
        {
            var abc = this.WhenAny(x => x.Passengers, x => x.Value).SelectMany(x => x.ToObservable()).SelectMany(x => x.SelectedObs);
        }
    }

Cool, thanks! This didn't quite give me my original goal of having a ReactiveDerivedList of the selected passengers in the main vm, but I was able to use it to get to where I wanted to go. :-)

Question though ... why the use of WhenAny(..., x => x.Value) instead of WhenAnyValue(...) ?