/// <summary>
/// Initializes a new instance of the MainViewModel class.
/// </summary>
public MainViewModel()
{
members = new ObservableCollection <Member>();
database = new MemberDB(members);
members = database.GetMemberships();
AddCommand = new RelayCommand(AddMethod);
ExitCommand = new RelayCommand <IClosable>(ExitMethod);
ChangeCommand = new RelayCommand(ChangeMethod);
Messenger.Default.Register <MessageMember>(this, ReceiveMember);
Messenger.Default.Register <NotificationMessage>(this, ReceiveMessage);
}