How to deal with multiple selections on a ListView control (WinRT) with RxUI

gistfile1.cs

//
// in the View constructor
this.WhenActivated(d =>
{
   d(MyListView.Events().SelectionChanged.Subscribe(args =>
   {
       foreach (var item in args.AddedItems.Cast<MyModelType>())
       {
           item.IsSelected = true;
       }
       
       foreach (var item in args.RemovedItems.Cast<MyModelType>())
       {
           item.IsSelected = false;
       }
   });
});

//
// in the ViewModel constructor
Models = new ReactiveList<MyModelType>(/* initialize... */);
SelectedModels = Models.CreateDerivedCollection(x => x, model => model.IsSelected);

//
// definition of the model object for completeness
public class MyModelType : ReactiveObject
{
    private bool _isSelected;
    public bool IsSelected
    {
        get { return _isSelected; }
        set { this.RaiseAndSetIfChanged(ref _isSelected, value); }
    }
}