如何解决为什么Popup的位置不正确？
重新定义了标准MenuItem模板。子元素MenuItem“关于程序“自己猜””的位置如下：MenuItem
弹出窗口的左边框必须与父元素的左边框对齐。这只能通过设置Placement="Relative"并使用VerticalOffset，HorizontalOffset来设置所需的位置来实现，但是如果将此样式连接到其他Menuitems，则定位将“ ”。做错了什么导致定位不对齐？
XAML：
<ControlTemplate x:Key="MenuItemControlTemplate1" TargetType="{x:Type MenuItem}">
<Border x:Name="templateRoot"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}"
SnapsToDevicePixels="True">
<Grid x:Name="Grid" VerticalAlignment="Center" HorizontalAlignment="Center">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Path x:Name="GlyphPanel" Data="F1M10,1.2L4.7,9.1 4.5,9.1 0,5.2 1.3,3.5 4.3,6.1 8.3,0 10,1.2z"
Fill="{TemplateBinding Foreground}"
FlowDirection="LeftToRight"
Margin="3"
Visibility="Collapsed"
VerticalAlignment="Center"/>
<ContentPresenter x:Name="ContentPresenter"
ContentTemplate="{TemplateBinding HeaderTemplate}"
Content="{TemplateBinding Header}"
Grid.Column="0"
ContentStringFormat="{TemplateBinding HeaderStringFormat}"
ContentSource="Header"
Margin="{TemplateBinding Padding}"
RecognizesAccessKey="True"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
<Popup x:Name="PART_Popup"
AllowsTransparency="True" Focusable="False"
IsOpen="{Binding IsSubmenuOpen,RelativeSource={RelativeSource TemplatedParent}}"
PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}"
PlacementTarget="{Binding ElementName=templateRoot}"
Placement="Bottom">
<Border x:Name="SubMenuBorder" BorderBrush="#FF999999" BorderThickness="1" Background="#FFF0F0F0" Padding="2">
<ScrollViewer x:Name="SubMenuScrollViewer"
Style="{DynamicResource {ComponentResourceKey ResourceId=MenuScrollViewer,TypeInTargetAssembly={x:Type FrameworkElement}}}">
<Grid x:Name="Grid1" RenderOptions.ClearTypeHint="Enabled">
<!--<Canvas x:Name="Canvas" HorizontalAlignment="Center" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect"
Fill="{Binding Background,ElementName=SubMenuBorder}"
Height="{Binding ActualHeight,ElementName=SubMenuBorder}"
Width="{Binding ActualWidth,ElementName=SubMenuBorder}"/>
</Canvas>-->
<ItemsPresenter x:Name="ItemsPresenter"
Grid.IsSharedSizeScope="True"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</ScrollViewer>
</Border>
</Popup>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSuspendingPopupAnimation" Value="True">
<Setter Property="PopupAnimation" TargetName="PART_Popup" Value="None"/>
</Trigger>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
</Trigger>
<Trigger Property="IsHighlighted" Value="True">
<Setter Property="Background" TargetName="templateRoot" Value="#3D26A0DA"/>
<Setter Property="BorderBrush" TargetName="templateRoot" Value="#FF26A0DA"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="#FF707070"/>
<Setter Property="Fill" TargetName="GlyphPanel" Value="#FF707070"/>
</Trigger>
<!--<Trigger Property="CanContentScroll" SourceName="SubMenuScrollViewer" Value="False">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding VerticalOffset,ElementName=SubMenuScrollViewer}"/>
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding HorizontalOffset,ElementName=SubMenuScrollViewer}"/>
</Trigger>-->
</ControlTemplate.Triggers>
</ControlTemplate>
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