回答編集履歴

  これで解決するかは不明ですが、Windows 10 & Visual Studio 2019で出したStyleを提示しておきます。

 

  

  <Window

  x:Class="Questions349003.MainWindow"

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

  Width="800"

  Height="450">

  <Window.Resources>

  <Style x:Key="FocusVisual">

  <Setter Property="Control.Template">

  <Setter.Value>

  <ControlTemplate>

  <Rectangle Margin="2" StrokeDashArray="1 2" SnapsToDevicePixels="true" StrokeThickness="1" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>

  </ControlTemplate>

  </Setter.Value>

  </Setter>

  </Style>

  <Style x:Key="OptionMarkFocusVisual">

  <Setter Property="Control.Template">

  <Setter.Value>

  <ControlTemplate>

  <Rectangle Margin="14,0,0,0" StrokeDashArray="1 2" SnapsToDevicePixels="true" StrokeThickness="1" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>

  </ControlTemplate>

  </Setter.Value>

  </Setter>

  </Style>

  <SolidColorBrush x:Key="RadioButton.Static.Background" Color="#FFFFFFFF"/>

  <SolidColorBrush x:Key="RadioButton.Static.Border" Color="#FF707070"/>

  <SolidColorBrush x:Key="RadioButton.Static.Glyph" Color="#FF212121"/>

  <SolidColorBrush x:Key="RadioButton.MouseOver.Background" Color="#FFF3F9FF"/>

  <SolidColorBrush x:Key="RadioButton.MouseOver.Border" Color="#FF5593FF"/>

  <SolidColorBrush x:Key="RadioButton.MouseOver.Glyph" Color="#FF212121"/>

  <SolidColorBrush x:Key="RadioButton.Pressed.Background" Color="#FFD9ECFF"/>

  <SolidColorBrush x:Key="RadioButton.Pressed.Border" Color="#FF3C77DD"/>

  <SolidColorBrush x:Key="RadioButton.Pressed.Glyph" Color="#FF212121"/>

  <SolidColorBrush x:Key="RadioButton.Disabled.Background" Color="#FFE6E6E6"/>

  <SolidColorBrush x:Key="RadioButton.Disabled.Border" Color="#FFBCBCBC"/>

  <SolidColorBrush x:Key="RadioButton.Disabled.Glyph" Color="#FF707070"/>

  <Style TargetType="{x:Type RadioButton}">

  <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>

  <Setter Property="Background" Value="{StaticResource RadioButton.Static.Background}"/>

  <Setter Property="BorderBrush" Value="{StaticResource RadioButton.Static.Border}"/>

  <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>

  <Setter Property="BorderThickness" Value="1"/>

  <Setter Property="Template">

  <Setter.Value>

  <ControlTemplate TargetType="{x:Type RadioButton}">

  <Grid x:Name="templateRoot" Background="Transparent" SnapsToDevicePixels="True">

  <Grid.ColumnDefinitions>

  <ColumnDefinition Width="Auto"/>

  <ColumnDefinition Width="*"/>

  </Grid.ColumnDefinitions>

  <Border x:Name="radioButtonBorder" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="100" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="1,1,2,1" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">

  <Grid x:Name="markGrid" Margin="2">

  <Ellipse x:Name="optionMark" Fill="{StaticResource RadioButton.Static.Glyph}" MinHeight="6" MinWidth="6" Opacity="0"/>

  </Grid>

  </Border>

  <ContentPresenter x:Name="contentPresenter" Grid.Column="1" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>

  </Grid>

  <ControlTemplate.Triggers>

  <Trigger Property="HasContent" Value="true">

  <Setter Property="FocusVisualStyle" Value="{StaticResource OptionMarkFocusVisual}"/>

  <Setter Property="Padding" Value="4,-1,0,0"/>

  </Trigger>

  <Trigger Property="IsMouseOver" Value="true">

  <Setter Property="Background" TargetName="radioButtonBorder" Value="{StaticResource RadioButton.MouseOver.Background}"/>

  <Setter Property="BorderBrush" TargetName="radioButtonBorder" Value="{StaticResource RadioButton.MouseOver.Border}"/>

  <Setter Property="Fill" TargetName="optionMark" Value="{StaticResource RadioButton.MouseOver.Glyph}"/>

  </Trigger>

  <Trigger Property="IsEnabled" Value="false">

  <Setter Property="Background" TargetName="radioButtonBorder" Value="{StaticResource RadioButton.Disabled.Background}"/>

  <Setter Property="BorderBrush" TargetName="radioButtonBorder" Value="{StaticResource RadioButton.Disabled.Border}"/>

  <Setter Property="Fill" TargetName="optionMark" Value="{StaticResource RadioButton.Disabled.Glyph}"/>

  </Trigger>

  <Trigger Property="IsPressed" Value="true">

  <Setter Property="Background" TargetName="radioButtonBorder" Value="{StaticResource RadioButton.Pressed.Background}"/>

  <Setter Property="BorderBrush" TargetName="radioButtonBorder" Value="{StaticResource RadioButton.Pressed.Border}"/>

  <Setter Property="Fill" TargetName="optionMark" Value="{StaticResource RadioButton.Pressed.Glyph}"/>

  </Trigger>

  <Trigger Property="IsChecked" Value="true">

  <Setter Property="Opacity" TargetName="optionMark" Value="1"/>

  </Trigger>

  <Trigger Property="IsChecked" Value="{x:Null}">

  <Setter Property="Opacity" TargetName="optionMark" Value="0.56"/>

  </Trigger>

  </ControlTemplate.Triggers>

  </ControlTemplate>

  </Setter.Value>

  </Setter>

  </Style>

  </Window.Resources>

  <Grid>

  <RadioButton Content="Content" />

  </Grid>

  </Window>

  ```

 

  出力の際に「すべてに適用」にしておくと、Styleをつけて回る手間が省けます。