WPF，Style中取父控件的属性值

使用示例：

<Window.Resources>
        <Style x:Key="radioButtonStyle" TargetType="{x:Type ListBox}">
            <Setter Property="ItemContainerStyle">
                <Setter.Value>
                    <Style TargetType="{x:Type ListBoxItem}">
                        <Setter Property="Template">
                            <Setter.Value>
                                <ControlTemplate TargetType="ListBoxItem">
                                    <RadioButton Focusable="False" IsChecked="{Binding Path=IsSelected,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}">
                                        <ContentPresenter></ContentPresenter>
                                    </RadioButton>
                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </Setter.Value>
            </Setter>
        </Style>
 </Window.Resources>