ContentPresenter在Windows 10的uwp應用程序不擴展到全寬

我有一個列表視圖和內容主持人的主/詳細信息頁面。我的問題是，當文本塊的內容小於當前窗口時，內容展示器不會填充父網格的整個剩餘空間。ContentPresenter在Windows 10的uwp應用程序不擴展到全寬

我曾嘗試添加HorizontalAlign ='Stretch'和VerticalAlign ='Stretch'，但沒有任何效果。

下面是該MasterDetailPage.xaml

<Page.Resources> 
    <DataTemplate x:Key="MasterListViewItemTemplate" x:DataType="data:List"> 
     <Grid Margin="0,11,0,13"> 
      <Grid.RowDefinitions> 
       <RowDefinition Height="Auto" /> 
       <RowDefinition Height="Auto" /> 
      </Grid.RowDefinitions> 

      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="*" /> 
       <ColumnDefinition Width="Auto" /> 
      </Grid.ColumnDefinitions> 

      <TextBlock Text="{x:Bind Title}" Style="{ThemeResource BaseTextBlockStyle}" /> 

      <TextBlock Style="{ThemeResource CaptionTextBlockStyle}" 
       Text="{x:Bind Date}" 
       Grid.Column="1" 
       Margin="12,1,0,0" /> 
     </Grid> 
    </DataTemplate> 

    <DataTemplate x:Key="DetailContentTemplate" x:DataType="data:List"> 
     <ScrollViewer VerticalScrollBarVisibility="Auto"> 
      <StackPanel 
       Orientation="Vertical" 
       Margin="0,9,12,9"> 
       <TextBlock 
       Margin="0,8" 
       Style="{ThemeResource TitleTextBlockStyle}" 
       TextWrapping="WrapWholeWords" 
       Text="{x:Bind Title}"/> 

       <RichTextBlock 
       x:Name="textContent" 
       IsTextSelectionEnabled="True" 
       TextWrapping="WrapWholeWords" 
       common:Html2TextParser.Html="{x:Bind Content}"/> 
      </StackPanel> 
     </ScrollViewer> 
    </DataTemplate> 

    <DataTemplate x:Key="comboListTemplate" x:DataType="data:Combo"> 
     <TextBlock Text="{x:Bind Title}"/> 
    </DataTemplate> 
</Page.Resources> 

<Grid x:Name="LayoutRoot" Loaded="LayoutRoot_Loaded" UseLayoutRounding="True"> 
    <VisualStateManager.VisualStateGroups> 
     <VisualStateGroup x:Name="AdaptiveStates" CurrentStateChanged="AdaptiveStates_CurrentStateChanged"> 
      <VisualState x:Name="DefaultState"> 
       <VisualState.StateTriggers> 
        <AdaptiveTrigger MinWindowWidth="720" /> 
       </VisualState.StateTriggers> 
      </VisualState> 

      <VisualState x:Name="NarrowState"> 
       <VisualState.StateTriggers> 
        <AdaptiveTrigger MinWindowWidth="0" /> 
       </VisualState.StateTriggers> 

       <VisualState.Setters> 
        <Setter Target="MasterColumn.Width" Value="*" /> 
        <Setter Target="DetailColumn.Width" Value="0" /> 
        <Setter Target="MasterListView.SelectionMode" Value="None" /> 
       </VisualState.Setters> 
      </VisualState> 
     </VisualStateGroup> 
    </VisualStateManager.VisualStateGroups> 

    <Grid.RowDefinitions> 
     <RowDefinition Height="Auto" /> 
     <RowDefinition Height="*" /> 
    </Grid.RowDefinitions> 

    <Grid.ColumnDefinitions> 
     <ColumnDefinition x:Name="MasterColumn" Width="320" /> 
     <ColumnDefinition x:Name="DetailColumn" Width="*" /> 
    </Grid.ColumnDefinitions> 

    <ComboBox 
     Name="comboList" 
     Margin="2,2,2,2" 
     ItemsSource="{x:Bind comboSource.combos}" 
     LayoutUpdated="comboList_LayoutUpdated" 
     SelectionChanged="comboList_SelectionChanged" 
     ItemTemplate="{StaticResource comboListTemplate}" 
     HorizontalAlignment="Stretch" /> 

    <ListView 
     x:Name="MasterListView" ItemsSource="{x:Bind listSource.lists}" 
     Grid.Row="1" 
     ItemContainerTransitions="{x:Null}" 
     ItemTemplate="{StaticResource MasterListViewItemTemplate}" 
     IsItemClickEnabled="True" 
     ItemClick="MasterListView_ItemClick"> 
     <ListView.ItemContainerStyle> 
      <Style TargetType="ListViewItem"> 
       <Setter Property="HorizontalContentAlignment" Value="Stretch" /> 
      </Style> 
     </ListView.ItemContainerStyle> 
    </ListView> 

    <ContentPresenter 
     x:Name="DetailContentPresenter" 
     Grid.Column="1" 
     Grid.RowSpan="2" 
     BorderThickness="1,0,0,0" 
     BorderBrush="{ThemeResource SystemControlForegroundBaseLowBrush}" 
     Content="{x:Bind MasterListView.SelectedItem, Mode=OneWay}" 
     ContentTemplate="{StaticResource DetailContentTemplate}" 
     HorizontalAlignment="Stretch" 
     VerticalAlignment="Stretch" 
     Margin="12,0,0,0"> 
     <ContentPresenter.ContentTransitions> 
      <!-- Empty by default. See MasterListView_ItemClick --> 
      <TransitionCollection /> 
     </ContentPresenter.ContentTransitions> 
    </ContentPresenter> 
</Grid>

誰能解決這個問題的代碼？這是我的問題的截圖。