public MainWindowViewModelSample()
 {
     Weather           = new WeatherBaseViewModelSample();
     Travel            = new TravelViewModelSample();
     SettingsViewModel = new SettingsViewModelSample();
 }
 public MainWindowViewModelSample()
 {
     Weather = new WeatherBaseViewModelSample();
     Travel = new TravelViewModelSample();
     SettingsViewModel = new SettingsViewModelSample();
 }