WPF小记 -- 使用Path自己画图标，点击命中(焦点)丢失问题

在Template中，Path外面的Grid需添加Background属性值。否则点击范围会受限制，例如：Click，在RadioButton的Height和With范围内点击，命中率<1。

 <Style TargetType="{x:Type RadioButton}">
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="FocusVisualStyle" Value="{x:Null}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <!--  Grid加上Background属性，点击命中不会丢失  -->
                    <Grid
                        x:Name="templateRoot"
                        Margin="5"
                        Background="Transparent"
                        SnapsToDevicePixels="True">
                        <Path
                            Name="path"
                            Width="20"
                            Height="20"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Data="M100.9,100.307 L181.5,100.307 181.5,180.60001 100.9,180.60001 z M0.5,100.307 L81.099999,100.307 81.099999,180.60001 0.5,180.60001 z M100.9,0.5 L181.5,0.5 181.5,80.793 100.9,80.793 z M0.50000539,0.5 L81.100006,0.5 81.100006,80.793 0.50000539,80.793 z"
                            Fill="#AAAAAA"
                            Stretch="Fill" />
                        <ContentPresenter
                            x:Name="contentPresenter"
                            Margin="{TemplateBinding Padding}"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Focusable="False"
                            RecognizesAccessKey="True"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter TargetName="path" Property="Fill" Value="#5A84F3" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>