UnderlinedRadioButtonStyle

MainPage.xaml

<Page x:Class="App34.MainPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:local="using:App34"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      mc:Ignorable="d"
      RequestedTheme="Dark"
      Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Page.Resources>
        <Style x:Key="UnderlinedRadioButtonStyle"
               TargetType="RadioButton">
            <Setter Property="Background"
                    Value="Transparent" />
            <Setter Property="Foreground"
                    Value="{ThemeResource RadioButtonForeground}" />
            <Setter Property="BorderBrush"
                    Value="{ThemeResource SystemAccentColor}" />
            <Setter Property="HorizontalAlignment"
                    Value="Stretch" />
            <Setter Property="VerticalAlignment"
                    Value="Stretch" />
            <Setter Property="HorizontalContentAlignment"
                    Value="Center" />
            <Setter Property="VerticalContentAlignment"
                    Value="Center" />
            <Setter Property="FontFamily"
                    Value="{ThemeResource ContentControlThemeFontFamily}" />
            <Setter Property="FontSize"
                    Value="{ThemeResource ControlContentThemeFontSize}" />
            <Setter Property="MinWidth"
                    Value="120" />
            <Setter Property="UseSystemFocusVisuals"
                    Value="{StaticResource UseSystemFocusVisuals}" />
            <Setter Property="FocusVisualMargin"
                    Value="0,0,0,-2" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="RadioButton">
                        <Grid x:Name="RootGrid"
                              Background="{TemplateBinding Background}">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*" />
                                <RowDefinition Height="2" />
                            </Grid.RowDefinitions>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Normal" />
                                    <VisualState x:Name="PointerOver">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                                                           Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0"
                                                                        Value="{ThemeResource RadioButtonPointerOverBorderThemeBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                                                           Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0"
                                                                        Value="{ThemeResource RadioButtonPointerOverBorderThemeBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                                                           Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0"
                                                                        Value="{ThemeResource RadioButtonForegroundDisabled}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="CheckStates">
                                    <VisualState x:Name="Checked">
                                        <VisualState.Setters>
                                            <Setter Target="UnderlineRectangle.Visibility"
                                                    Value="Visible" />
                                        </VisualState.Setters>
                                    </VisualState>
                                    <VisualState x:Name="Unchecked" />
                                    <VisualState x:Name="Indeterminate" />
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>

                            <Rectangle x:Name="UnderlineRectangle"
                                       Fill="{TemplateBinding BorderBrush}"
                                       Visibility="Collapsed"
                                       Grid.Row="1" />

                            <ContentPresenter x:Name="ContentPresenter"
                                              AutomationProperties.AccessibilityView="Raw"
                                              ContentTemplate="{TemplateBinding ContentTemplate}"
                                              Content="{TemplateBinding Content}"
                                              ContentTransitions="{TemplateBinding ContentTransitions}"
                                              Foreground="{TemplateBinding Foreground}"
                                              HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                              Margin="{TemplateBinding Padding}"
                                              TextWrapping="Wrap"
                                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Page.Resources>
    <Grid>
        <StackPanel Orientation="Horizontal" VerticalAlignment="Top"
                    HorizontalAlignment="Center" Background="#603D3D3D"
                    Margin="50" Height="80">
            <RadioButton Style="{StaticResource UnderlinedRadioButtonStyle}"
                         Content="Enhance" Width="120" IsChecked="True" />
            <RadioButton  Style="{StaticResource UnderlinedRadioButtonStyle}"
                          Content="Adjust" Width="120" />
        </StackPanel>
    </Grid>
</Page>