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public enum VideoState
{
    Idle,
    Playing,
    Paused,
    Stopped
}

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public partial class App : Application
    {
        public App()
        {
            InitializeComponent();

            RxApp.DefaultExceptionHandler = new RxExceptionHandler();

            Instance.InitializeForms();

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namespace ReactiveToDoSample
{
    public class NavigationParameterConstants
    {
        public const string ItemId = "ItemId";
    }
}

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namespace ReactiveToDoSample.ViewModels
{
    public class ItemViewModel : ViewModelBase
    {
        public ItemViewModel(IParameterViewStackService navigationService, IItemManager itemManager) : base(navigationService)
        {
            _itemManager = itemManager;

            var canExecute = this.WhenAnyValue(x => x.Title, (title) => !string.IsNullOrEmpty(title));

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<?xml version="1.0" encoding="UTF-8" ?>
<rxui:ReactiveContentPage
    x:Class="ReactiveToDoSample.Views.ItemPage"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:rxui="clr-namespace:ReactiveUI.XamForms;assembly=ReactiveUI.XamForms"
    xmlns:vm="clr-namespace:ReactiveToDoSample.ViewModels"
    x:TypeArguments="vm:ItemViewModel">
    <rxui:ReactiveContentPage.ToolbarItems>
        <ToolbarItem Command="{Binding CloseCommand}" Text="Close" />

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namespace ReactiveToDoSample.ViewModels
{
    public class HomeViewModel : ViewModelBase
    {
        public HomeViewModel(IParameterViewStackService navigationService, IItemManager itemManager) : base(navigationService)
        {
           DeleteCommand = ReactiveCommand.Create<Item>(itemManager.Remove);

           itemManager
                .ItemChanges

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<?xml version="1.0" encoding="UTF-8" ?>
<rxui:ReactiveContentPage
    x:Class="ReactiveToDoSample.Views.HomePage"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:rxui="clr-namespace:ReactiveUI.XamForms;assembly=ReactiveUI.XamForms"
    xmlns:vm="clr-namespace:ReactiveToDoSample.ViewModels"
    x:Name="homePage"
    Title="Reactive ToDo"
    x:TypeArguments="vm:HomeViewModel">

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 public class ItemManager : IItemManager
    {
        public ItemManager()
        {
            ItemChanges = _itemsCache.Connect()
                                     .RefCount();
        }

        public Optional<Item> Get(string id) => _itemsCache.Lookup(id);

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namespace ReactiveToDoSample.Managers
{
    public interface IItemManager
    {
        public IObservable<IChangeSet<Item, string>> ItemChanges { get; }

        public Optional<Item> Get(string id);

        public void AddOrUpdate(Item item);

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namespace ReactiveToDoSample.Models
{
    public class Item : ReactiveObject
    {
        public Item(string id, string title)
        {
            Id = id;
            Title = title;
        }