private void registrarPagoToolStripMenuItem_Click(object sender, EventArgs e)
{
RegistrarPago registrarPago = new RegistrarPago();
registrarPago.MdiParent = this;
registrarPago.Show();
}
private void btnRegistrarPago_Click(object sender, RoutedEventArgs e)
{
RegistrarPago registrarReferencias = new RegistrarPago();
registrarReferencias.WindowStartupLocation = WindowStartupLocation.CenterScreen;
this.Hide();
registrarReferencias.ShowDialog();
}