public override void ViewDidAppear(bool animated)
 {
     base.ViewDidAppear(animated);
     PointsContainerViewController.PageYOffset = ScrollView.ContentOffset.Y;
     PointsContainerViewController.ChangeSelectedButton(PageIndex);
 }
 public PointsPageViewControllerDataSource(PointsContainerViewController viewController)
 {
     _parentViewController = viewController;
 }