float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
self.SetProperty(Toolkit::ItemView::Property::LAYOUT_POSITION, firstItemScrollPosition );
float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
self.SetProperty(Toolkit::ItemView::Property::LAYOUT_POSITION, firstItemScrollPosition );