How can I show images with scrollable textblock in ListBox elements on Windows Phone 7.5?

I have a horizontal scrollable ListBox with Binding. A ListBox item: -Image -Text about image

I would like to show, that I can scroll horizontally between images and I can scroll vertically on textblock.

http://ift.tt/1CnPc3j

I try it this xaml code:

        <ListBox Name="lstB" ItemsSource="{Binding}" ScrollViewer.HorizontalScrollBarVisibility="Visible">
        <ListBoxItem>
            <VirtualizingStackPanel Orientation="Horizontal"/>
        </ListBoxItem>
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <Border BorderThickness="2" BorderBrush="Black" Height="300" Width="410">
                        <Image Source="{Binding Url}"/>
                    </Border>

                    <TextBlock Text="{Binding Comment}" ScrollViewer.VerticalScrollBarVisibility="Visible"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>                
    </ListBox>

But It show the whole elements vertically scrollable, not only textblock.

There are some tipps anybody, how can I do it?

Thanks!