HomePage.xaml

<?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">
    <StackLayout Padding="20">
    <CollectionView
        ItemsSource="{Binding Items}"
        SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
        SelectionMode="Single">
         <CollectionView.ItemsLayout>
                <GridItemsLayout Orientation="Vertical"
                                VerticalItemSpacing="10" />
            </CollectionView.ItemsLayout>
        <CollectionView.ItemTemplate>
            <DataTemplate>
                <Frame Style="{StaticResource CardFrameStyle}">
                     <Frame.Triggers>
                        <DataTrigger TargetType="Frame"
                                        Binding="{Binding IsCompleted}"
                                        Value="True">
                            <Setter Property="Opacity" Value="0.2" />
                        </DataTrigger>
                    </Frame.Triggers>
                    <StackLayout Orientation="Horizontal">
                         <CheckBox IsChecked="{Binding IsCompleted}"/>
                         <Label Text="{Binding Title}"
                                HorizontalOptions="FillAndExpand"
                                FontAttributes="Bold"
                                VerticalOptions="Center"/>

                        <Label Text="🗑"
                               VerticalOptions="EndAndExpand">
                            <Label.GestureRecognizers>
                                <TapGestureRecognizer Command="{Binding Source={x:Reference homePage}, Path=BindingContext.DeleteCommand}"
                                                      CommandParameter="{Binding}"/>
                            </Label.GestureRecognizers>
                        </Label>
                    </StackLayout>
              </Frame>
            </DataTemplate>
        </CollectionView.ItemTemplate>
      </CollectionView>
       <Button Style="{StaticResource CircularButtonStyle}"
                Command="{Binding AddCommand}"
                Text="+"/>
    </StackLayout>
</rxui:ReactiveContentPage>