private void SetupCurrentWorkDay(WorkDay workDay)
        {
            CurrentDay = new WorkDay(workDay.WorkTime.DateOfWork);
            var tmp = dataManager.CurrentUser.AssignedWorkDays.FirstOrDefault(d => d.WorkTime.DateOfWork.Date.Equals(workDay.WorkTime.DateOfWork.Date));

            if (tmp != null)
            {
                CurrentDay.Update(tmp);
                WorkItems = CurrentDay.AssignedWorkItems;

                return;
            }

            CurrentDay.WorkTime.Begin = dataManager.CurrentUser.UserSettings.DefaultBeginOfWork;
            CurrentDay.WorkTime.End   = dataManager.CurrentUser.UserSettings.DefaultEndOfWork;
            CurrentDay.BreakTime      = dataManager.CurrentUser.UserSettings.DefaultBreakTime;
            WorkItems = CurrentDay.AssignedWorkItems;

            hasChanged = true;
        }