private void altaProveedores(object sender, RoutedEventArgs e)
{
var window = new proveedoresAlta {
Owner = this
};
window.Show();
}
private void openModificar(object sender, RoutedEventArgs e)
{
var selectedItem = (DataRowView)lista.SelectedItem;
var idToModify = selectedItem["id_proveedor"].ToString();
proveedoresAlta prov = new proveedoresAlta(idToModify);
prov.Show();
}