private void btnModificar_Click(object sender, RoutedEventArgs e)
{
Marcas r = ((Button)sender).DataContext as Marcas;
long lID = r.ID;
Popups.Marca w = new Popups.Marca(lID);
w.ShowDialog();
realizarBusqueda(new Marcas());
}
private void btnAdd_Click(object sender, RoutedEventArgs e)
{
Popups.Marca w = new Popups.Marca();
w.ShowDialog();
realizarBusqueda(new Marcas());
}