public object Clone()
        {
            var clone = new ObservableProjectTaskTimesheetItem();

            clone.ProjectCode = (ObservablePickListItem)ProjectCode.Clone();


            clone.TaskCode = (ObservablePickListItem)TaskCode.Clone();


            clone.TimeEntries = new ObservableCollection <ObservableTimeEntry>();
            foreach (var item in TimeEntries)
            {
                clone.TimeEntries.Add(item);
            }


            clone.AttachEventHandlers();
            clone.AcceptChanges();
            return(clone);
        }