Option to set Handled when manipulation is layered


First of all: what a nice solution to add gesture support in SL4!
I have a page with a kind of SwipeGesture (using the Manipulate2DBehavior attached to the LayoutRoot) to navigate forward or back.
On the page is a ScrollViewer with the ScrollViewerTouchScrollBehavior.
Now when i scroll horizontally, not only does the scroll occure, but also the navigate.
So for this scenario I would like to use scrolling without invoking the navigation in parent control.
A possible solution whould be to implement a kind of Handled to prevent bubbling of gestures.