Describe the bug

The RadioButtons control (which is used to group multiple radio button controls together allows navigation as follows-

• Pressing tab into the radio buttons control should bring focus to the selected radio button. If no radio button is selected, pressing tab should bring focus to the first radio button.
• Pressing tab again takes focus out of the radio buttons control. However, to navigate within the radio buttons, the arrow keys are used.
  This is the built in expected behavior.

However, when the radio buttons control is used within XAML islands, pressing tab always takes the focus to the first item (not to the selected item). Keyboard navigation does not work.

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Try to tab navigate and arrow navigate in this user control within a XAML island. The keyboard navigation does not work as expected.

<UserControl
    x:Class="Microsoft.PowerToys.Settings.UI.Views.ShellPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:behaviors="using:Microsoft.PowerToys.Settings.UI.Behaviors"
    xmlns:winui="using:Microsoft.UI.Xaml.Controls"
    xmlns:helpers="using:Microsoft.PowerToys.Settings.UI.Helpers"
    xmlns:views="using:Microsoft.PowerToys.Settings.UI.Views"
    xmlns:ic="using:Microsoft.Xaml.Interactions.Core"
    xmlns:i="using:Microsoft.Xaml.Interactivity"
    xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
    mc:Ignorable="d">


    <Grid>
        <muxc:RadioButtons>
            <RadioButton>Item 1</RadioButton>
            <RadioButton>Item 2</RadioButton>
            <RadioButton>Item 3</RadioButton>
        </muxc:RadioButtons>
    </Grid>
</UserControl>

Expected behavior

Screenshots

However, this navigation does not work within a XAML island.

Version Info

NuGet package version:

Microsoft.UI.Xaml.2.5.0-prerelease.200708003

Windows app type: UWP app within a XAML Island.

Additional context

Link to Issue in the PowerToys Page - microsoft/PowerToys#6032