public PackageListViewModel(RelayCommand<string> navCommand)
		{
			NavigationViewModel = new NavigationViewModel(navCommand, "InnovatorSettings", "PackagePartSelection");
		}
		public PackagePartSelectionViewModel(RelayCommand<string> navCommand)
		{
			NavigationViewModel = new NavigationViewModel(navCommand, "PackageList", "RequiredProperties");
		}
		public InnovatorSettingsViewModel(InputPropertyPackage inputPropertyPackage, RelayCommand<string> navCommand)
		{
			_inputPropertyPackage = inputPropertyPackage;
			NavigationViewModel = new NavigationViewModel(navCommand, "", "PackageList");
		}