剪辑 ToggleButton 会将其包裹在一些小边框中

Question

我有一个完全扁平的ToggleButton样式，取自MahApps 。 它看起来不错，当我将几个ToggleButtons放置时 - 我看到它们之间没有间距。 但是当我尝试Clip那个ToggleButton时 - 它会在它周围添加一个小边框或垂直和水平透明线，就像这样 - 外边框和内部剪辑按钮之间的小红线：

我怎样才能摆脱那个边界？

这些是我的Style和Clip资源：

<UserControl.Resources>

    <SolidColorBrush x:Key="BrushMain" Color="#FF454545"/>

    <GeometryGroup x:Key="GeometryGroupFullScreenClipLeft">
        <PathGeometry FillRule="EvenOdd">
            <PathGeometry.Figures>
                <PathFigureCollection>
                    <PathFigure IsClosed="True" StartPoint="0,0">
                        <PathFigure.Segments>
                            <PathSegmentCollection>
                                <LineSegment Point="0,23"/>
                                <LineSegment Point="23,23"/>
                                <LineSegment Point="23,18"/>
                                <LineSegment Point="5,0"/>
                                <LineSegment Point="0,0"/>
                            </PathSegmentCollection>
                        </PathFigure.Segments>
                    </PathFigure>
                </PathFigureCollection>
            </PathGeometry.Figures>
        </PathGeometry>
    </GeometryGroup>

    <Style x:Key="StyleToggleButtonFullScreenLeft" TargetType="{x:Type ToggleButton}">
        <Setter Property="Background" Value="{StaticResource BrushMain}"/>
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="FocusVisualStyle" Value="{DynamicResource MahApps.Metro.Styles.FlatButtonFocusVisualStyle}"/>
        <Setter Property="FontSize" Value="{DynamicResource FlatButtonFontSize}"/>
        <Setter Property="Foreground" Value="{DynamicResource FlatButtonForegroundBrush}"/>
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ToggleButton}">
                    <Viewbox SnapsToDevicePixels="True">
                        <Grid>
                            <Border x:Name="Border" Margin="0"
                                    Width="23" Height="23"
                                    Clip="{StaticResource GeometryGroupFullScreenClipLeft}"
                                    BorderBrush="{TemplateBinding BorderBrush}"
                                    BorderThickness="{TemplateBinding BorderThickness}"
                                    Background="{TemplateBinding Background}"
                                    SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                                <ContentControl x:Name="PART_ContentPresenter"
                                                      Padding="{TemplateBinding Padding}"
                                                      Content="{TemplateBinding Content}"
                                                      ContentTemplate="{TemplateBinding ContentTemplate}"
                                                      ContentStringFormat="{TemplateBinding ContentStringFormat}"
                                                      VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                                                      HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                      SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                                </ContentControl>
                            </Border>
                            <!--<Path Stroke="DarkGray" StrokeThickness="1"
                                  Data="{StaticResource GeometryGroupFullScreenOutlineLeft}">
                            </Path>-->
                        </Grid>
                    </Viewbox>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="Background" Value="DarkGray"/>
            </Trigger>
            <Trigger Property="IsPressed" Value="True">
                <Setter Property="Background" Value="Blue"/>
                <Setter Property="Foreground" Value="{DynamicResource FlatButtonPressedForegroundBrush}"/>
            </Trigger>
            <Trigger Property="IsEnabled" Value="False">
                <Setter Property="Foreground" Value="{DynamicResource GrayBrush2}"/>
            </Trigger>
        </Style.Triggers>
    </Style>

</UserControl.Resources>

在这里使用我的切换按钮：

<Border x:Name="BorderCameraSingle00" Grid.Column="0"
        VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
        Background="Red"
        BorderBrush="{StaticResource BrushMain}" BorderThickness="25">

    <ToggleButton x:Name="ToggleButtonFullScreenLeft"
                  VerticalAlignment="Bottom" HorizontalAlignment="Left"
                  Width="92" Height="92"
                  Style="{StaticResource StyleToggleButtonFullScreenLeft}">
    </ToggleButton>

</Border>