public static void RepositionContextScroll(LinkViewModel parentLink)
{
var viewModelContextService = ServiceLocator.Current.GetInstance<IViewModelContextService>();
var firstRedditViewModel = viewModelContextService.ContextStack.FirstOrDefault(context => context is RedditViewModel) as RedditViewModel;
if (firstRedditViewModel != null)
{
firstRedditViewModel.TopVisibleLink = parentLink;
}
}