WPF Scrollviewer PanningMode move Window?

I have add a ScrollViewer in my WPF4 Window with Scrol开发者_运维问答lViewer.PanningMode. When I drag scrollviewer on my multitouch screen it's OK. But... the Window move with scroll when I arrive on top scroll or bottom scroll. How can we avoid this?

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Edit: To complete the answer: There is a native event for this which can just be marked as handled: ManipulationBoundaryFeedback

This movement is called boundary feedback which is governed by the operating system (can be set by users in the Pen and Touch settings on the Panning tab). I do not know if the Windows API allows you to prevent it, this page might be relevant.