Update observableobject bind to picker on maui

[candinho1987]

Hi everyone, i'n new to c# and i need some help with updating picker items.
My VM:
`

{
[ObservableProperty]
[NotifyPropertyChangedFor(nameof(DescricaoNovaMedida))]
string descricaoN;

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(SiglaNovaMedida))]
    string siglaN;

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(ConvervorNovaMedida))]
    decimal conversorN;
    public string DescricaoNovaMedida => descricaoN;
    public string SiglaNovaMedida => siglaN;
    public double ConvervorNovaMedida => Convert.ToDouble(conversorN);
    [RelayCommand]
    void SalvarNovaMedida()
    {
        Medida medida = new Medida();
        medida.Descricao = DescricaoNovaMedida;
        medida.Sigla = SiglaNovaMedida;
        medida.Conversor = Convert.ToDecimal(ConvervorNovaMedida);
        using (var context = new AppDbContext())
        {
            context.Medida.Add(medida);
            context.SaveChanges();
            

        }
        

    }
    

}

`

I can add a new item, but if i don't close the page e open it again, my picker doesn't get updated.
Picker xaml:
<Picker Grid.Column="0" Grid.Row="5" WidthRequest="200" HeightRequest="32" BackgroundColor ="CadetBlue" HorizontalOptions="Start" Margin="5,0,0,0" ItemsSource="{Binding MedidasView.Medidas}" ItemDisplayBinding="{Binding Descricao}" />
Picker VM.

`
public class MedidasViewModel : ObservableObject
{
ObservableCollection _medidas;

    public ObservableCollection<Medida> Medidas
    {
        get { return _medidas; }
        set { _medidas = value; }
    }

    public MedidasViewModel()
    {
        _medidas = new ObservableCollection<Medida>();

        using (AppDbContext context = new AppDbContext())
        {
            List<Medida> lista = context.Medida.ToList();


            foreach (var item in lista)
            {
                _medidas.Add(item);

            }
        }
    }

}

}`