private async void DeleteAllNotifications(object sender, EventArgs e)
 {
     var action = await DisplayActionSheet("Slett alle varsler", "Avbryt", null, "OK");
     if (action != null && action == "OK")
     {
         DbNotification dbNotification = new DbNotification();
         dbNotification.DeleteAllNotifications();
     }
     //Sort();
     ExcecuteRefreshCommand();
 }