silverlight listbox 无法 stretch

如果将listbox的ItemTemplate绑定到DataTemplate，会发现listbox无法stretch。

解决办法是将listbox的ItemContainerStyle绑定到一个style。如下所示：

<Style x:Key="ListBoxItemStyle" TargetType="ListBoxItem">
         <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
         <Setter Property="VerticalContentAlignment" Value="Top"/>
         <Setter Property="Template">
            <Setter.Value>
               <ControlTemplate TargetType="ListBoxItem">
                  <StackPanel Orientation="Vertical" HorizontalAlignment="Stretch" Margin="0 0 0 25">
                     <Grid Background="#ebf8ff" HorizontalAlignment="Stretch" Height="25">
                        <StackPanel Orientation="Horizontal">
                           <TextBlock Text="{Binding CreateDate,Mode=TwoWay}" Foreground="#686868" VerticalAlignment="Center" Margin="12 0 0 0"/>
                           <TextBlock Text="{Binding CreateBy,Mode=TwoWay}" Foreground="#0b4292" Margin="10 0" VerticalAlignment="Center"/>
                           <TextBlock Text="{Binding FollowReportTitle,Mode=TwoWay}" VerticalAlignment="Center"/>
                        </StackPanel>
                     </Grid>
                     <TextBlock Text="{Binding Body,Mode=TwoWay}" HorizontalAlignment="Stretch" TextWrapping="Wrap" Margin="12 5 0 5" />
                     <ItemsControl x:Name="icAttachments" ItemsSource="{Binding Attachments,Mode=TwoWay}"
                                   VerticalAlignment="Center" ItemTemplate="{StaticResource listBoxFollowStyle}"  Margin="12 0 0 0">
                        <ItemsControl.Template>
                           <ControlTemplate  TargetType="ItemsControl">
                              <ItemsPresenter   />
                           </ControlTemplate>
                        </ItemsControl.Template>
                        <ItemsControl.ItemsPanel>
                           <ItemsPanelTemplate>
                              <StackPanel  Name="sp" Orientation="Vertical"/>
                           </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                     </ItemsControl>
                  </StackPanel>
               </ControlTemplate>
            </Setter.Value>
         </Setter>
      </Style>