Align listbox items horizontally

I want to show a listbox with two items for each row.

You can see an example here.

I have the following XAML:

<Grid x:Name="FriendsGrid">
    <ListBox x:Name="FriendsList" Margin="0" ItemTemplate="{StaticResource FriendsDataTemplate}"/>
</Grid开发者_开发百科>

<DataTemplate x:Key="FriendsDataTemplate">
    <Grid VerticalAlignment="Top" HorizontalAlignment="Right" Background="{StaticResource PhoneAccentBrush}">
        <Grid.RowDefinitions>
            <RowDefinition Height="183"/>
            <RowDefinition Height="50"/>
        </Grid.RowDefinitions>
        <Image x:Name="FriendAvatar" Margin="1,1,11,11" Source="{Binding ImageURL}" Width="173" Height="173"/>
        <Grid Grid.Row="1" HorizontalAlignment="Right" VerticalAlignment="Top">
            <TextBlock x:Name="FriendName" Margin="0" Text="{Binding FriendName}" Grid.Row="1" TextWrapping="Wrap" VerticalAlignment="Center" HorizontalAlignment="Center" Padding="0,0,10,0" TextAlignment="Right"/>
        </Grid>
    </Grid>
</DataTemplate>

But I see one ListBoxItem for each row.

How can I do that?

---

Can you not just use a WrapPanel as the ItemContainerStyle?