public UnconferenceViewModel()
        {
            databaseModel = new DatabaseAccess();
            phoneModel = new PhoneModel();

            this._viewDetailsCommand = new CommandBase(ViewDetails) { IsEnabled = true };
            this._addToFavoritesCommand = new CommandBase(AddToFavorites) { IsEnabled = true };
            this._removefromFavoriteCommand = new CommandBase(RemoveFromFavorites) { IsEnabled = true };
            this._createReminderCommand = new CommandBase(CreateReminder) { IsEnabled = true };
            this._removeReminderCommand = new CommandBase(RemoveReminder) { IsEnabled = true };
        }
        public MainViewModel()
        {
            this.Places = new ObservableCollection<PlaceViewModel>();
            this.Photos = new ObservableCollection<PhotoViewModel>();
            this.Tweets = new ObservableCollection<MessageViewModel>();
            this.Unconferences = new ObservableCollection<UnconferenceViewModel>();
            this.FavoritesUnconferences = new ObservableCollection<UnconferenceViewModel>();

            this.servicesModel = new ServicesAccess();
            this.servicesModel.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(servicesModel_PropertyChanged);

            //this.rssModel = new RssAccess();
            //this.rssModel.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(rssModel_PropertyChanged);

            this.databaseModel = new DatabaseAccess();
        }