public TrackedDayRecordViewModel()
{
DrinkTypes = Mapper.Map <ObservableCollection <DrinkTypeViewModel> >(DrinkTypesService.GetAll());
DrinkType = DrinkTypes.FirstOrDefault();
Time = DateTime.Now.TimeOfDay;
Volume = _step;
DecreasePortionCommand = new Command(DecreasePortion);
IncreasePortionCommand = new Command(IncreasePortion);
}