public MainViewModel()
        {
            _model = LyncModel.Instance;
            _model.StateChanged += new EventHandler <StateChangedEventArgs>(_model_StateChanged);

            _model.SignIn(Properties.Settings.Default.LyncAccountEmail, Properties.Settings.Default.LyncAccountDomainUser, Properties.Settings.Default.LyncAccountPassword);
        }
        public MainViewModel()
        {
            _model = LyncModel.Instance;
            _model.StateChanged += new EventHandler<StateChangedEventArgs>(_model_StateChanged);

            _model.SignIn(Properties.Settings.Default.LyncAccountEmail, Properties.Settings.Default.LyncAccountDomainUser, Properties.Settings.Default.LyncAccountPassword);
        }