WeatherApp Samples with C# Markup and outside refresh

[kni]

What would you like to be added:

https://github.com/unoplatform/Uno.Samples/tree/master/UI/MvuxHowTos/WeatherApp/WeatherApp

I made a WeatherApp variant with C# Markup.
But I have a question.
I can add a Refresh Button outside FeedView with XAML. It is worked.

    <Grid utu:SafeArea.Insets="Bottom,Top">
        <mvux:FeedView x:Name="feedView" Source="{Binding CurrentWeather}">
            <DataTemplate>
                <StackPanel>
                <TextBlock DataContext="{Binding Data}" Text="{Binding Temperature}" />
                <Button Content="Refresh" Command="{Binding Refresh}" />
                </StackPanel>
            </DataTemplate>
            <mvux:FeedView.ProgressTemplate>
                <DataTemplate>
                <TextBlock Text="Requesting temperature..."/>
                </DataTemplate>
            </mvux:FeedView.ProgressTemplate>
        </mvux:FeedView>
        <Button Content="Refresh outside" Command="{Binding Refresh, ElementName=feedView}" />
    </Grid>
</Page>

But with C# Markup it is NOT worked.
What am I doing wrong?

public sealed partial class MainPage : Page {

    public MainPage() {

        this.DataContext = new BindableWeatherModel(new WeatherService());

        this.DataContext<BindableWeatherModel>((page, vm) => page
            .Background(ThemeResource.Get<Brush>("ApplicationPageBackgroundThemeBrush"))
            .Content(
                new StackPanel()
                    .VerticalAlignment(VerticalAlignment.Center)
                    .HorizontalAlignment(HorizontalAlignment.Center)
                    .Children(
                        new TextBlock()
                            .Text("Hello Uno Platform!"),
                        new FeedView()
                            .Name(out var WeatherFeed)
                            .Source(() => vm.CurrentWeather)

                            .ProgressTemplate(() =>
                                new StackPanel().Children(
                                    new TextBlock().Text("Requesting temperature...")
                                )
                            )

                            .ValueTemplate<FeedViewState>(feedViewState =>
                                new StackPanel().Children(
                                    new TextBlock().Text(() => (WeatherInfo)feedViewState.Data!, w => $"Temperature: {w.Temperature}"),
                                    new Button()
                                       .Margin(10)
                                       .Content("Refresh")
                                       .Command(() => WeatherFeed.Refresh)
                                       // or .Command(() => feedViewState.Refresh)
                                )
                            ),
                        new Button()
                            .Margin(10)
                            .Content("Refresh outside")
                            .Command(() => WeatherFeed.Refresh)
                           
                    )
            )
        );
    }
}

Why is this needed:

There are few examples of C# Markup

For which Platform:

• iOS
• Android
• WebAssembly
• WebAssembly Renderers for Xamarin.Forms
• [x ] Windows

Anything else we need to know?