code: public Double getTotalToDo(WorkitemFilter filter) {
          filter = (filter != null) ? filter : new WorkitemFilter();
  
          return getSum("OwnedWorkitems", filter, "ToDo");
      }
docs: Return the total to do for all workitems owned by this member optionally
  filtered.
  
  @param filter Criteria to filter workitems on.
  @return total to do of selected Workitems.