private static bool SprintBacklogOnlyItem(Task t)
 {
     if (t.GetType() != typeof(SprintBacklogItem))
         return false;
     return ((SprintBacklogItem)t).IsOnlyInSprintBacklog;
 }
 private static bool NotComittedBacklogItem(Task t)
 {
     return t.GetType() == typeof(ProductBacklogItem);
 }