private void tipoActToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AgregarTipo at = new AgregarTipo();

            at.MdiParent = this;
            at.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            AgregarTipo at = new AgregarTipo();

            at.Show();
        }