private void MailHelperOnUnreadCountChanged(object sender, MailHelper.UnreadCountChangedEventArgs e)
	    {
	        InvokeOnMainThread(() =>
	        {
	            var tabItem = TabBar.Items.First(item => item.Tag == 1);
                tabItem.BadgeValue = e.UnreadCount > 0 ? e.UnreadCount.ToString() : null;
	        });
	    }
 private void MailHelperOnUnreadCountChanged(object sender, MailHelper.UnreadCountChangedEventArgs e)
 {
     UpdateBadgeCount();
 }