public NuevoPuntoMedicion(CategoriasViewModel vm)
 {
     InitializeComponent();
     capturaViewModel = new CapturaViewModel();
     capturaViewModel.PropertyChanged += capturaViewModel_PropertyChanged;
     capturaViewModel.InitDefault(vm);
     categoriaViewModel = vm;
     dtpFecha.Focus();
     this.DataContext = capturaViewModel;
 }
        //Editar registro existente
        public NuevoPuntoMedicion(RegistroModel registroModel, CategoriasViewModel vm)
        {
            InitializeComponent();
            capturaViewModel = new CapturaViewModel();
            capturaViewModel.PropertyChanged += capturaViewModel_PropertyChanged;
            categoriaViewModel = vm;
            capturaViewModel.InitEdit(registroModel, categoriaViewModel);
            this.DataContext = capturaViewModel;

            //dtpFecha.Focus();
            dtpFecha.IsEnabled = false;
            cbxHora.IsEnabled = false;
            cbxMinutos.IsEnabled = false;
        }