Library Stack vs PreviewContactTapGesture

So now I've got scatterviewitems being added to the library stack the next task is to get a tap gesture on the librarystack to trigger all the loops held in the stack. This should just be as easy as:

lbs[0].PreviewContactTapGesture += new ContactEventHandler(SurfaceWindow1_PreviewContactTapGesture);

However that doesn't seem to work in my application. I suspect that it's because of the way I've added the LibraryStack. Here's the Xaml for the surface window.

Grid.Column="0"
x:Name="MainScatterView"

ItemTemplate="{StaticResource ScatterViewItemDataTemplate}"
ItemsSource="{Binding SourceItems}"

s:Contacts.PreviewContactTapGesture="onPreviewContactTapGesture"
s:Contacts.PreviewContactHoldGesture="MainScatterView_PreviewContactHoldGesture"
s:SurfaceDragDrop.DragCanceled="OnDragCanceled"
s:SurfaceDragDrop.DragCompleted="OnDragCompleted"
s:Contacts.ContactChanged="MainScatterView_ContactChanged"
/>
x:Name="LibraryScatterView"
Grid.Column="0"
>

The LibrarySyack is just added to the LibraryScatterView item, which I suspect is capturing the tap gestures. Lets see what a few experiments turn up.