public WorkoutExerciseAddViewModel()
{
WorkoutExerciseAdd = new WorkoutExercise();
WorkoutExerciseList = new ObservableCollection <WorkoutExercise>(new WorkoutExerciseRepository().GetAll());
WorkoutList = new WorkoutRepository().GetAll().OrderByDescending(o => o.ExpirationDate).ToList();
ExerciseList = new ExerciseRepository().GetAll().OrderBy(o => o.Name).ToList();
WorkoutAdd = WorkoutList.FirstOrDefault();
ExerciseAdd = ExerciseList.FirstOrDefault();
SaveCommand = new Command(SaveWorkoutExercise);
LoadCommand = new Command <WorkoutExercise>(LoadWorkoutExercise);
DeleteCommand = new Command <WorkoutExercise>(DeleteWorkoutExercise);
}