private void pictureBox1_Click(object sender, EventArgs e)
        {
            var frmMarcas = new frmMantMarcas();

            frmMarcas.ShowDialog();
        }
        private void marcasToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var frmMarcas = new frmMantMarcas();

            frmMarcas.ShowDialog();
        }