private void Button_Click(object sender, RoutedEventArgs e)
        {
            Localizar    localizar = new Localizar();
            IInsumoGeral item;

            localizar.ShowDialog();
            LocalizarViewModel model = (LocalizarViewModel)localizar.DataContext;

            if (model.InsumoSelecionado != null)
            {
                item = model.InsumoSelecionado;
            }
        }
        public Localizar()
        {
            InitializeComponent();

            DataContext = new LocalizarViewModel();
        }