private async void OnTirarFoto()
        {
            if (IsBusy)
            {
                return;
            }

            IsBusy = true;

            try
            {
                var arquivo = await PickMedia.GetPhotoFromCamera();

                if (arquivo != null)
                {
                    AnexoUrl    = arquivo.Path;
                    anexoStream = arquivo.GetStream();
                }
            }
            catch (Exception ex)
            {
                await Application.Current.MainPage.DisplayAlert("Erro", ex.Message, "Ok");
            }
            finally
            {
                IsBusy = false;
            }
        }
        private async void OnGaleria()
        {
            if (IsBusy)
            {
                return;
            }

            IsBusy = true;

            try
            {
                var arquivo = await PickMedia.GetPhotoFromGallery();

                if (arquivo != null)
                {
                    ImgLogoEmpresa       = arquivo.Path;
                    imgLogoEmpresaStream = arquivo.GetStream();
                }
            }
            catch (Exception ex)
            {
                await Application.Current.MainPage.DisplayAlert("Erro", ex.Message, "Ok");
            }
            finally
            {
                IsBusy = false;
            }
        }