public MainWindowViewModel()
        {
            _openStreamingcmd = new RelayCommand(OpenStreamingCmd, CanStreaming);
            _openMediacmd = new RelayCommand(OpenMediaCmd, CanOpenMedia);
            _quitcmd = new RelayCommand(QuitCmd, () => true);
            _aboutcmd = new RelayCommand(AboutCmd, CanAbout);
            _tipscmd = new RelayCommand(TipsCmd, CanTips);
            _konamiAcmd = new RelayCommand(KonamiCmd, () => true);
            _konamiBcmd = new RelayCommand(KonamiCmd, () => true);
            _konamiDowncmd = new RelayCommand(KonamiCmd, () => true);
            _konamiLeftcmd = new RelayCommand(KonamiCmd, () => true);
            _konamiRightcmd = new RelayCommand(KonamiCmd, () => true);
            _konamiUpcmd = new RelayCommand(KonamiCmd, () => true);

            PlaylistViewModel playlist = new PlaylistViewModel(this);
            MainViewModel mainView = new MainViewModel(this, playlist) { IsCurrentPage = true };

            _about = null;
            _tips = null;
            _stream = null;
            _k = new Konami();
            _page = new ViewModelBase[(int)PageEnum.COUNT_PAGE];
            _page[(int)PageEnum.MAIN] = mainView;
            _page[(int)PageEnum.PLAYLIST] = playlist;
            CurrentPageBase = _page[(int)PageEnum.MAIN];
        }
        public MainWindowViewModel()
        {
            _openStreamingcmd = new RelayCommand(OpenStreamingCmd, CanStreaming);
            _openMediacmd     = new RelayCommand(OpenMediaCmd, CanOpenMedia);
            _quitcmd          = new RelayCommand(QuitCmd, () => true);
            _aboutcmd         = new RelayCommand(AboutCmd, CanAbout);
            _tipscmd          = new RelayCommand(TipsCmd, CanTips);
            _konamiAcmd       = new RelayCommand(KonamiCmd, () => true);
            _konamiBcmd       = new RelayCommand(KonamiCmd, () => true);
            _konamiDowncmd    = new RelayCommand(KonamiCmd, () => true);
            _konamiLeftcmd    = new RelayCommand(KonamiCmd, () => true);
            _konamiRightcmd   = new RelayCommand(KonamiCmd, () => true);
            _konamiUpcmd      = new RelayCommand(KonamiCmd, () => true);

            PlaylistViewModel playlist = new PlaylistViewModel(this);
            MainViewModel     mainView = new MainViewModel(this, playlist)
            {
                IsCurrentPage = true
            };

            _about  = null;
            _tips   = null;
            _stream = null;
            _k      = new Konami();
            _page   = new ViewModelBase[(int)PageEnum.COUNT_PAGE];
            _page[(int)PageEnum.MAIN]     = mainView;
            _page[(int)PageEnum.PLAYLIST] = playlist;
            CurrentPageBase = _page[(int)PageEnum.MAIN];
        }