internal void AddTimerSet()
        {
            TimerSets.Add(new TimerSet()
            {
                Timers = new List <AtomicTimer>()
                {
                    new AtomicTimer()
                    {
                        Duration = new TimeSpan(0, 0, 1)
                    }
                }
            });
            var currentTimers = TimerSets.ToList <TimerSet>();

            AppCore.CurrentWorkout.Timers = currentTimers;
            var blub = AppCore.Workouts.Where(wo => wo.Id == this.WorkoutId).First();

            blub = AppCore.CurrentWorkout;
            SaveTimerSets();
            //{
            //    SetId = Guid.NewGuid().ToString(),
            //    Name = "neues Set",
            //    Repetitions = 1,
            //    Timers = new List<AtomicTimer>()
            //            {
            //                new AtomicTimer(){Name = "Timer",Repetitions = 1, Duration = new TimeSpan(0,0,1)}
            //            }
            //});
            //throw new NotImplementedException();
        }
        public void LoadTimerSets()
        {
            //var dbMgr = new DatabaseManager();

            //TODO timerSets = dbMgr.readEntry(workoutId);
            // hier das aktuelle set aus dem appcore.currentworkout ziehen
            TimerSets.Clear();
            foreach (var item in AppCore.CurrentWorkout.Timers)
            {
                TimerSets.Add(item);
            }
            if (TimerSets.Count() == 0)
            {
                TimerSets.Add(new TimerSet());
                //SaveTimerSets();
            }
        }