void CatrobatListViewWorker_ManipulationDelta(object sender, Windows.UI.Xaml.Input.ManipulationDeltaRoutedEventArgs e)
{
if (e.IsInertial)
{
e.Complete();
}
if (_dragging == CatrobatListViewDragStaus.Dragging)
{
DeltaDrag(e.Position.Y);
}
e.Handled = true;
}