listbox布局怎么换行？

HTML code

<ListBox Height="166" HorizontalAlignment="Left" Margin="12,192,0,0" Name="lstMessage" VerticalAlignment="Top" Width="400" DataContext="{Binding}">    <ListBox.ItemTemplate>        <DataTemplate>            <StackPanel Orientation="Horizontal" Width="400">                <TextBlock Text="{Binding A}" Width="400" />                <TextBlock Text="{Binding B}" Width="400" />                <Image Source="{Binding C}" Width="50"  />                <Image Source="{Binding D}" Width="50"  />            </StackPanel>        </DataTemplate>    </ListBox.ItemTemplate></ListBox>

怎么换行？现在listbox里面无论内容多少，都不会换行！

[解决办法]
把StackPanel换成wrappanel
wrappanel是toolkit里的控件