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if (frmPersonal == null) {
			frmPersonal = new FrmPersonal(this, true);
		}
		frmPersonal.setVisible(true);

package org.springhispano.screancast01;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JToolBar;
import javax.swing.JButton;
import java.awt.FlowLayout;
import javax.swing.AbstractAction;
import java.awt.event.ActionEvent;
import javax.swing.Action;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import java.awt.event.ActionListener;

public class FrmPrincipal extends JFrame {

	FrmPersonal frmPersonal;

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					FrmPrincipal frame = new FrmPrincipal();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	public FrmPrincipal() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);

		JMenuBar barPrincipal = new JMenuBar();
		setJMenuBar(barPrincipal);

		JMenu mnuRecursosHumanos = new JMenu("Recursos Humanos");
		barPrincipal.add(mnuRecursosHumanos);

		JMenu mnuPersonal = new JMenu("Personal");
		mnuRecursosHumanos.add(mnuPersonal);

		JMenuItem mnuRegistro = new JMenuItem("registro");
		mnuRegistro.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				mnuRegistro_actionPerformed(e);
			}

		});
		mnuPersonal.add(mnuRegistro);
		JPanel contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(new BorderLayout(0, 0));

		JPanel panel = new JPanel();
		contentPane.add(panel, BorderLayout.EAST);

		JPanel panel_2 = new JPanel();
		contentPane.add(panel_2, BorderLayout.WEST);

		JPanel panel_3 = new JPanel();
		contentPane.add(panel_3, BorderLayout.CENTER);

		JPanel panel_4 = new JPanel();
		contentPane.add(panel_4, BorderLayout.SOUTH);
	}

	private void mnuRegistro_actionPerformed(ActionEvent e) {
		if (frmPersonal == null) {
			frmPersonal = new FrmPersonal(this, true);
		}
		frmPersonal.setVisible(true);
	}

}

package org.springhispano.screancast01;

import java.awt.BorderLayout;

public class FrmPersonal extends JDialog {

	private final JPanel contentPanel = new JPanel();

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		try {
			FrmPersonal dialog = new FrmPersonal(null,false);
			dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
			dialog.setVisible(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the dialog.
	 */
	public FrmPersonal(Frame owner, boolean modal) {
		super(owner, modal);
		setTitle("Personal");
		setBounds(100, 100, 450, 300);
		getContentPane().setLayout(new BorderLayout());
		contentPanel.setLayout(new FlowLayout());
		contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
		getContentPane().add(contentPanel, BorderLayout.CENTER);
	}

}