private void registrarToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            PacienteRegistrar f = new PacienteRegistrar();

            f.MdiParent = this;
            f.Show();
        }
        private void btnNuevo_Click(object sender, EventArgs e)
        {
            this.Close();

            PacienteRegistrar f = new PacienteRegistrar();

            f.MdiParent = this.MdiParent;
            f.Show();
        }