kmpdfkit_demo/compdfkit_demo_windows/compdfkit/compdfkit-assets/Styles/RadioButtonStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style x:Key="ColorfulRadioButtonStyle" TargetType="{x:Type RadioButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <Grid>
                        <Ellipse x:Name="BorderEllipse"
                                 Fill="{TemplateBinding Background}"
                                 Stroke="{TemplateBinding BorderBrush}"
                                 StrokeThickness="{TemplateBinding BorderThickness}"
                                 Width="{TemplateBinding Width}"
                                 Height="{TemplateBinding Height}" />
                        <Ellipse x:Name="InnerEllipse"
                                 Fill="{TemplateBinding Tag}"
                                 StrokeThickness="0"
                                 Width="{Binding ActualWidth, ElementName=BorderEllipse}"
                                 Height="{Binding ActualHeight, ElementName=BorderEllipse}"
                                 Margin="{Binding ActualWidth, ElementName=BorderEllipse}" />
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="True">
                            <Setter TargetName="BorderEllipse" Property="StrokeThickness" Value="2" />
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="BorderEllipse" Property="StrokeThickness" Value="1" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>