public void SaveChanged()
{
TimerSheetViewModel tsvm = new TimerSheetViewModel(Countdown.Hours, Countdown.Minutes, Countdown.Seconds, Countdown.Description);
timer.Tick += tsvm.Tick;
tsvm.DoRemoveButton = RemoveButton;
TimerSheets.Add(tsvm);
Countdown.Hours = 0;
Countdown.Minutes = 0;
Countdown.Seconds = 0;
Countdown.Description = "";
}
private void RemoveButton(TimerSheetViewModel viewModel)
{
TimerSheets.Remove(viewModel);
}