private static void OnDurationChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
SmoothScrollViewer viewer = sender as SmoothScrollViewer;
viewer.m_animation.Duration = new Duration((TimeSpan)e.NewValue);
viewer.m_endingAnimation.BeginTime = viewer.m_animation.Duration.TimeSpan;
}
private static void OnOffsetChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
SmoothScrollViewer viewer = sender as SmoothScrollViewer;
viewer.ScrollToVerticalOffset((double)e.NewValue);
}