Enabling ScrollViewer HorizontalSnapPoints with bindable collection

I'm trying to create a similar experience as in the ScrollViewerSample from the Windows 8 SDK samples to be able to snap to the items inside a ScrollViewer when scrolling left and right. The implementation from the sample (which works) is like this:

<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>

The only difference with my desired implementation is that I don't want a StackPanel with items inside, but something I can bind to. I am trying to accomplish this with an ItemsControl, but for some reason the Snap behavior does not kick in:

<ScrollViewer x:Name="scrollViewer" Width="480" Height="270"
              HorizontalAlignment="Left" VerticalAlignment="Top"