WinUI 3 Radio Button Centering

I'm trying to convert a WPF C# application to use WinUI 3. This is a simplified version of my XAML code:

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="*"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <StackPanel Grid.Row="0" Grid.Column="0" 
        Orientation="Horizontal"
        HorizontalAlignment="Center" VerticalAlignment="Center">
        <TextBlock Text="1234567890123456789012345678901234567890"/>
    </StackPanel>
    <StackPanel Grid.Row="1" Grid.Column="0" 
        Orientation="Horizontal"
        HorizontalAlignment="Center" VerticalAlignment="Center">
        <RadioButton GroupName="Choices" Content="Yes" />
    </StackPanel>
    <StackPanel Grid.Row="2" Grid.Column="0"
        Orientation="Horizontal"
        HorizontalAlignment="Center" VerticalAlignment="Center">
        <Button Content="Prev"/>
        <Button Content="Next"/>
    </StackPanel>
</Grid>

In my WPF application, this XAML centers the RadioButton appropriately:

The same XAML produces this result in my WinUI 3 application:

How do I get the radio button to center properly? Ultimately I'm going to be dynamically adding a varying number of radio buttons to the stack panel, but I can't even get it to work for just one that's statically defined.

This is due to the RadioButon's MinWidth, which is 120 by default. You can learn more about this in the generic.xaml.

You can directly update the RadioButton's MinWidth:

<RadioButton MinWidth="0" .../>

or update it via a style:

<Style
    BasedOn="{StaticResource DefaultRadioButtonStyle}"
    TargetType="RadioButton">
    <Setter Property="MinWidth" Value="0" />
</Style>