HorizontalContentAlign=“Stretch” 并更改列表框 Windows Phone 8 中的突出

我正在为Windows Phone 8开发一些简单的应用程序。我有一个列表框，列表框项有两个文本块（一个与屏幕左侧对齐，第二个与屏幕右侧对齐）。这些文本块与 <Setter Property="HorizontalContentAlignment" Value="Stretch"/> 对齐。我找到了一种在此处更改活动项目突出显示颜色的方法（将背景颜色更改为强调色）。我的问题是我不能同时使用这两种解决方案。当我这样做时，拉伸对齐被忽略，文本块与左侧对齐：

    <phone:PhoneApplicationPage.Resources>
    <Style x:Key="ListBoxItemStyle1" TargetType="ListBoxItem">
        <Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ListBoxItem">
                    <Border x:Name="LayoutRoot" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" HorizontalAlignment="Stretch" VerticalAlignment="{TemplateBinding VerticalAlignment}">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="MouseOver"/>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="LayoutRoot">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource TransparentBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimation Duration="0" To=".5" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="ContentContainer"/>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="SelectionStates">
                                <VisualState x:Name="Unselected"/>
                                <VisualState x:Name="Selected">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentContainer" Storyboard.TargetProperty="Foreground" Duration="0">
                                            <DiscreteObjectKeyFrame  KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <SolidColorBrush Color="White"/>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="border" Storyboard.TargetProperty="Background" Duration="0">
                                            <DiscreteObjectKeyFrame  KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <SolidColorBrush Color="{StaticResource PhoneAccentColor}"/>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <StackPanel x:Name="border" Orientation="Horizontal" HorizontalAlignment="Stretch">
                            <ContentControl x:Name="ContentContainer" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="Stretch"/>
                        </StackPanel>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</phone:PhoneApplicationPage.Resources>    

我应该怎么做才能让两个解决方案协同工作？

<Grid x:Name="border">
    <ContentControl x:Name="ContentContainer" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="Stretch"/>
</Grid>