public void StartWork()
 {
     Mode = "Work";
     CurrentTimer = new TimerViewModel(WorkDuration);
     CurrentTimer.Finished += WorkFinished;
     CurrentTimer.Start();
 }
 public void StartBreak()
 {
     Mode = "Break";
     CurrentTimer = new TimerViewModel(BreakDuration);
     CurrentTimer.Finished += BreakFinished;
     CurrentTimer.Start();
 }