private void changeContent()
{
var list = ContentListView.ItemsSource <TimeStopListModel <StopGroup> >();
var selectedItem = list.FirstOrDefault(x => x.Stop == stop) ?? list.First();
int delta = Int32.Parse(selectedItem.Time);
int n = 1, sgn = -1;
foreach (var item in list)
{
item.Position = sgn * n++;
item.Time = (Int32.Parse(item.Time) - delta).ToString();
if (item.Stop == selectedItem.Stop)
{
item.Position = 0;
sgn = 1;
}
}
}