Problems with ScrollViewer inside a Kinect Region

Hi,
I'm building a WPF application using KinectRegion. I have a Scrollviewer inside the KinectRegion, scrolling with HandPointer works fine. I want to know when the scrolling interaction has finished (the user open his/her hand). Which event should I use? I
thought it was ManipulationCompleted (and ManipulationStart for closing the hand) but it is not being fired.
I also noted that the scrollviewer goes on scrolling even when the user's hand is moving outside the "screen zone", how can i disable this behavior? (so scrolling stops in the border of the screen).
Thank you.

Thanks Carmine, I will explain myself better.
I would like to build a "carousel" component: a ScrollViewer with several images inside. I would like it to have some kind of "gravity effect" so when the user "drops" the carousel it will automatically navigate to a certain
position (according to the extent of the scroll action). I can track scroll changes through the proper event in the ScrollViewer, but I need to know when the scrolling interaction has finished.
For a different component, I'm using the code Rob Relyea posted here to
build a custom IKinectControl so I can attach event handlers to Kinect Manipulation events (and I know when a dragging interaction has finished through ManipulationCompleted event in the IKinectController), but if I use a similar pattern for the carousel,
the ScrollViewer inside the IKinectControl seems to capture the events and ManipulationCompleted for the parent element is never triggered.
How can I access to low level interaction for a ScrollViewer? I don't know how KinectRegion handle interactions for child elements.

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