private void UnregisterRadBookItemHandlers(RadBookItem[] radBookItems) { if (radBookItems == null) { throw new ArgumentException("radBookItems"); } foreach (RadBookItem item in radBookItems) { KinectRegion.RemoveHandPointerEnterHandler(item, OnHandPointerEnterPage); KinectRegion.RemoveHandPointerLeaveHandler(item, OnHandPointLeavePageRegion); } }