Habilitando o ScrollViewer HorizontalSnapPoints com coleção vinculável

Eu estou tentando criar uma experiência semelhante como no ScrollViewerSample dos exemplos de SDK do Windows 8 para ser capaz de encaixar os itens dentro de um ScrollViewer ao rolar para a esquerda e para a direita. A implementação da amostra (que funciona) é assim:

<code><ScrollViewer x:Name="scrollViewer" Width="480" Height="270"
              HorizontalAlignment="Left" VerticalAlignment="Top"
              VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Auto" 
              ZoomMode="Disabled" HorizontalSnapPointsType="Mandatory">
    <StackPanel Orientation="Horizontal">
        <Image Width="480" Height="270" AutomationProperties.Name="Image of a cliff" Source="images/cliff.jpg" Stretch="None"  HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of Grapes" Source="images/grapes.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of Mount Rainier" Source="images/Rainier.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of a sunset" Source="images/sunset.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of a valley" Source="images/valley.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
    </StackPanel>
</ScrollViewer>
</code>

A única diferença com a minha implementação desejada é que eu não quero um StackPanel com itens dentro, mas algo que eu possa ligar. Eu estou tentando fazer isso com um ItemsControl, mas por algum motivo o comportamento Snap não entra em ação:

<code><ScrollViewer x:Name="scrollViewer" Width="480" Height="270"
              HorizontalAlignment="Left" VerticalAlignment="Top"
              VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Auto" 
              ZoomMode="Disabled" HorizontalSnapPointsType="Mandatory">
    <ItemsControl>
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <StackPanel Orientation="Horizontal" />
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of a cliff" Source="images/cliff.jpg" Stretch="None"  HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of Grapes" Source="images/grapes.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of Mount Rainier" Source="images/Rainier.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of a sunset" Source="images/sunset.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Image Width="480" Height="270" AutomationProperties.Name="Image of a valley" Source="images/valley.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
    </ItemsControl>
</ScrollViewer>
</code>

Sugestões seria muito apreciada!

Graças ao Denis, acabei usando o seguinte Style no ItemsControl e removi o ScrollViewer e o inline ItemsPanelTemplate por completo:

<code><Style x:Key="ItemsControlStyle" TargetType="ItemsControl">
    <Setter Property="ItemsPanel">
        <Setter.Value>
            <ItemsPanelTemplate>
                <VirtualizingStackPanel Orientation="Horizontal"/>
            </ItemsPanelTemplate>
        </Setter.Value>
    </Setter>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ItemsControl">
                <ScrollViewer Style="{StaticResource HorizontalScrollViewerStyle}" HorizontalSnapPointsType="Mandatory">
                    <ItemsPresenter />
                </ScrollViewer>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
</code>

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