public void Touch()
{
if (Replies != null)
{
for (int i = 0; i < Replies.Count; i++)
{
var comment = Replies[i] as CommentViewModel;
var more = Replies[i] as MoreViewModel;
if (comment != null) comment.Touch();
if (more != null) more.Touch();
}
}
RaisePropertyChanged("IsVisible");
}