How to put background image to radio button in wpf

Question

Same as title

Answer 1

You can change the Template : RadioButton Styles and Templates
with many samples on Google, like How to make WPF RadioButton Style?
where you can add any image in background

Answer 2

Here are two RadioButton styles with image backgrounds.

MainWindow.xaml:

<Window.Resources>  
        <Style  x:Key="radio" TargetType="{x:Type RadioButton}" >  
            <Setter Property="Template">  
                <Setter.Value>  
                    <ControlTemplate TargetType="{x:Type RadioButton}">  
                        <BulletDecorator Name="BD_Check"  Background="Transparent"    Cursor="Hand">  
                            <BulletDecorator.Bullet>  
                                <Grid Height="15" Width="15">  
                                    <Border Name="RadioDefault"    BorderBrush="Gray"    BorderThickness="1"     CornerRadius="35" />  
                                    <Border Name="RadioChecked"   BorderBrush="Gray"      BorderThickness="1"     CornerRadius="35" >  
                                        <Border.Background>  
                                            <ImageBrush ImageSource="spring.jpg" Stretch="Uniform"/>  
                                        </Border.Background>  
                                    </Border>  
                                </Grid>  
                            </BulletDecorator.Bullet>  
                            <TextBlock Margin="5 0 0 0"  Foreground="#FF3E3E3E" FontSize="15">  
                           <ContentPresenter />  
                            </TextBlock>  
                        </BulletDecorator>  
                        <ControlTemplate.Triggers>  
                            <Trigger Property="IsChecked" Value="true">  
                                <Setter TargetName="RadioChecked" Property="Visibility" Value="Visible"/>  
                                <Setter TargetName="RadioDefault" Property="Visibility" Value="Hidden" />  
                            </Trigger>  
                            <Trigger Property="IsChecked" Value="false">  
                                <Setter TargetName="RadioChecked" Property="Visibility" Value="Hidden"/>  
                                <Setter TargetName="RadioDefault" Property="Visibility" Value="Visible" />  
                            </Trigger>  
                        </ControlTemplate.Triggers>  
                    </ControlTemplate>  
                </Setter.Value>  
            </Setter>  
        </Style>  
        <Style x:Key="Flag" TargetType="RadioButton">  
            <Style.Triggers>  
                <Trigger Property="IsChecked" Value="False">  
                    <Setter Property="Opacity" Value="0.5"/>  
                </Trigger>  
            </Style.Triggers>  
            <Setter Property="BorderThickness" Value="2"/>  
            <Setter Property="Template">  
                <Setter.Value>  
                    <ControlTemplate TargetType="RadioButton">  
                        <Border BorderThickness="{TemplateBinding BorderThickness}"  BorderBrush="{TemplateBinding BorderBrush}"   Background="{Binding}"   CornerRadius="20">  
                            <Image Source="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent}}"/>  
                        </Border>  
                    </ControlTemplate>  
                </Setter.Value>  
            </Setter>  
        </Style>  
    </Window.Resources>  
    <StackPanel>  
        <RadioButton  BorderBrush="Red" Width="100" Height="50">  
                <WrapPanel>  
                    <Image Source="spring.jpg" Width="56" Height="46"  Margin="0,0,5,0"/>  
                    <TextBlock Text="No" Foreground="Red" />  
                </WrapPanel>  
            </RadioButton>  
            <RadioButton Content="spring.jpg" Style="{StaticResource Flag}" BorderBrush="Green" Width="40" Height="40"/>  
            <RadioButton Content="images.jpg" Style="{StaticResource Flag}" BorderBrush="Blue" Width="40" Height="40"/>  

    </StackPanel>  

The result:

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