Horizontal list inside LongListSelector

Im trying to approach following LongListSelector item:

List item text
SubItem 1 SubItem 2 SubItem 3

So the list item has one line of text ("List item text") and nested horizontal list (SubItem 1 SubItem 2...).

I have tried to build this using ItemTemplate with data template etc but can not get nested list workin.

My source data is in following format:

public class Data
{
    public string title{ get; set; }
    public List<SubItem> SubItems{ get; set; }

}

All examples are welcome :)

You can define ItemsPanel to either WP Toolkit's WrapPanel or just <StackPanel Orientation="Horizontal" />

<phone:LongListSelector ItemsSource="{Binding Data}">
    <phone:LongListSelector.ItemTemplate>
        <DataTemplate>
            <StackPanel>
                <TextBlock Text="{Binding Title}" />
                <ListBox ItemsSource="{Binding SubItems}">
                    <ListBox.ItemsPanel>
                        <ItemsPanelTemplate>
                            <StackPanel Orientation="Horizontal" />
                        </ItemsPanelTemplate>
                    </ListBox.ItemsPanel>
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding SubItemTitle}" Margin="0,0,12,0" />
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </StackPanel>
        </DataTemplate>
    </phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>

You can see I am using ListBox in the inner list because to my knowledge LongListSelector doesn't expose that.