/// <summary>
 /// Création d'un nouveau ViewModel de thème
 /// </summary>
 public NatalChartViewModel(
     IFileService fileService,
     ITimeZoneProvider tzProvider,
     IAstroService astroService
     )
 {
     //DateUT = new DateUT(DateTime.Now);
     //Longitude = new SweNet.Longitude(5, 20, 0, LongitudePolarity.East);
     //Latitude = new SweNet.Latitude(47, 52, 0, LatitudePolarity.North);
     //HouseSystem = HouseSystem.Placidus;
     //Planets.AddRange(new Planet[] {
     //    Planet.Sun, Planet.Moon, Planet.Mercury, Planet.Venus, Planet.Mars, Planet.Jupiter,
     //    Planet.Saturn, Planet.Uranus, Planet.Neptune, Planet.Pluto,
     //    Planet.MeanNode, Planet.TrueNode,
     //    Planet.MeanApog, Planet.OscuApog, Planet.Earth
     //});
     //Planets.AddRange(new Planet[] { Planet.AsAsteroid(433), Planet.AsAsteroid(3045), Planet.AsAsteroid(7066) });
     this.AstroService           = astroService;
     _FileService                = fileService;
     _TimeZoneProvider           = tzProvider;
     FileName                    = null;
     IsDirty                     = false;
     Definition                  = new NatalChartDefinitionViewModel(_TimeZoneProvider);
     Definition.PropertyChanged += Definition_PropertyChanged;
 }
 /// <summary>
 /// Réinitialisation du thème
 /// </summary>
 public void Reset()
 {
     Definition = new NatalChartDefinitionViewModel(_TimeZoneProvider);
     Definition.PropertyChanged += Definition_PropertyChanged;
     NatalChart = null;
     RaisePropertyChanged(() => Definition);
     RaisePropertyChanged(() => NatalChart);
     FileName = null;
     IsDirty  = false;
 }