Problema para exibir janelas internas no net beans [Resolvido]

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.beans.PropertyVetoException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.AbstractAction;
import javax.swing.JFrame;

public class FramePrincipal extends JFrame implements ActionListener, KeyListener {

    private MDIDesktopPane desktop = new MDIDesktopPane();
//    private JMenuBar menuBar = new JMenuBar();
    private JMenu fileMenu = new JMenu("File");
    private JMenuItem newMenu = new JMenuItem("New");
    private JScrollPane scrollPane = new JScrollPane();
    public JToolBar toolBar;
    private AbstractAction actionNew;
    private AbstractAction actionOpen;
    private AbstractAction actionSave;
    private AbstractAction actionExit;
    private AbstractAction actionClientes;
    private AbstractAction actionOrdemServico;
    private AbstractAction actionMarcas;
    private AbstractAction actionTipoequipamento;
    public int getHeight;
    public Boolean telaClientes = false;
    public int larguraBotao = 100;
    public int alturaBotao = 50;
    public static final String FontNames[] = {"Serif", "SansSerif", "Courier"};
    protected Font fonts[];
    protected JMenuItem[] fontMenus;
    protected JCheckBoxMenuItem boldMenu = new JCheckBoxMenuItem("Bold");
    protected JCheckBoxMenuItem italicMenu = new JCheckBoxMenuItem("Italic");
    ImageIcon sairButtonIcon = createImageIcon("resources/exit24.png");
    ImageIcon clienteButtonIcon = createImageIcon("resources/kontact_contacts.png");
    ImageIcon ordemservicoButtonIcon = createImageIcon("resources/systemsettings.png");
    ImageIcon sobreButtonIcon = createImageIcon("resources/stockhelp.png");
    static FrameClientes frameClientes;
    static FrameMarcas frameMarcas;
    static FrameOrdemServico frameOrdemServico;
    public JLabel LabelDataHora;
    public JLabel LabelUsuario;

    public FramePrincipal() {
//        menuBar.add(fileMenu);
        super("SAT - Sistema de Assistência Técnica V. 1.0");

        javax.swing.UIManager.put("OptionPane.yesButtonText", "Sim");
        javax.swing.UIManager.put("OptionPane.noButtonText", "Não");
        javax.swing.UIManager.put("OptionPane.okButtonText", "Ok");
        javax.swing.UIManager.put("OptionPane.cancelButtonText", "Cancelar");

        fonts = new Font[FontNames.length];
        for (int i = 0; i < FontNames.length; i++) {
            fonts[i] = new Font(FontNames[i], Font.PLAIN, 12);
        }

        int inset = 50;
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        getHeight = screenSize.height;
        setBounds(inset, inset,
                screenSize.width - inset * 2,
                screenSize.height - inset * 2);
        JMenuBar menuBar = createMenuBar();
        menuBar.add(new WindowMenu(desktop));
//        fileMenu.add(newMenu);
        setJMenuBar(menuBar);
        //setTitle("MDI Test");
        scrollPane.getViewport().add(desktop);
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(scrollPane, BorderLayout.CENTER);
        getContentPane().add(toolBar, BorderLayout.NORTH);


        JLabel LabelUsuario = new JLabel();
        JLabel LabelDataHora = new JLabel();

        //        tfIdCliente.setBounds(10,25,30,20);
        //       tfNomeCliente.setBounds(80,25,400,20);


        LabelUsuario.setText("Usuário:                Data: ");
        LabelUsuario.setBounds(110, 01, 10, 30);
        LabelDataHora.setText("Data: ");
        LabelDataHora.setBounds(200, 01, 280, 30);

        StatusBar statusBar = new StatusBar();
        statusBar.add(LabelUsuario);
        getContentPane().add(statusBar, BorderLayout.SOUTH);


        getContentPane().add(desktop);

        addWindowListener(new WindowAdapter() {

            public void windowClosing(WindowEvent e) {
                quit();
            }
        });
        newMenu.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent ae) {
                desktop.add(new TextFrame());
            }
        });
        desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
        FramePrincipal1.setDefaultLookAndFeelDecorated(true);
        LookAndFeelInfo[] lafs = (LookAndFeelInfo[]) UIManager.getInstalledLookAndFeels();

        desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
        this.setVisible(true);
        this.setExtendedState(JFrame.MAXIMIZED_BOTH);

        listenKeyboard(getComponents());

    }

    public static void main(String[] args) throws InterruptedException, ClassNotFoundException {
        createAndShowGUI();

    }

    public static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = FrameModelo.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }

    protected JMenuBar createMenuBar() {
        final JMenuBar menuBar = new JMenuBar();

        JMenu assistencia = new JMenu("Assistência");
        assistencia.setMnemonic('A');

        //ImageIcon iconNew = new ImageIcon(clienteButtonIcon);

//        JMenu menu = new JMenu("Assistência");
//        menu.setMnemonic(KeyEvent.VK_A);
//        menu.setMnemonic('A');

        actionClientes = new AbstractAction("Clientes ", clienteButtonIcon) {

            public void actionPerformed(ActionEvent e) {
                acaoBotoes(e);
            }
        };

//        JMenuItem item = assistencia.add(actionClientes);
        JMenuItem item = new JMenuItem("Clientes");
        item.setMnemonic(KeyEvent.VK_C);
        item.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_C, ActionEvent.ALT_MASK));
        item.setActionCommand("clientes");
        item.setIcon(clienteButtonIcon);
        item.addActionListener(this);
        assistencia.add(item);

        actionOrdemServico = new AbstractAction("Ordem de Serviço ", ordemservicoButtonIcon) {

            public void actionPerformed(ActionEvent e) {
                acaoBotoes(e);
            }
        };

//        item = assistencia.add(actionOrdemServico);
        item = new JMenuItem("Ordem Serviço");
        item.setMnemonic(KeyEvent.VK_O);
        item.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_O, ActionEvent.ALT_MASK));
        item.setActionCommand("ordemservico");
        item.setIcon(ordemservicoButtonIcon);
        item.addActionListener(this);
        assistencia.add(item);

        actionMarcas = new AbstractAction("Marcas ", clienteButtonIcon) {

            public void actionPerformed(ActionEvent e) {
                acaoBotoes(e);
            }
        };

//        item = assistencia.add(actionMarcas);
        item = new JMenuItem("Marcas");
        item.setActionCommand("marcas");
        item.setMnemonic(KeyEvent.VK_M);
        item.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_M, ActionEvent.ALT_MASK));
        item.setIcon(ordemservicoButtonIcon);
        item.addActionListener(this);
        assistencia.add(item);

        assistencia.addSeparator();

        actionExit = new AbstractAction("Sair", sairButtonIcon) {

            public void actionPerformed(ActionEvent e) {
                acaoBotoes(e);
            }
        };

//        item = assistencia.add(actionExit);
        item = new JMenuItem("Sair");
        item.setActionCommand("sair");
        item.setMnemonic(KeyEvent.VK_F4);
        item.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_F4, ActionEvent.ALT_MASK));
        item.setActionCommand("quit");
        item.setIcon(sairButtonIcon);
        item.addActionListener(this);

        item.setMnemonic('S');
        assistencia.add(item);

        menuBar.add(assistencia);

        toolBar = new JToolBar();

        JButton btn1 = toolBar.add(actionClientes);
        btn1.setToolTipText("Cadastro de Clientes");
        btn1.setActionCommand("clientes");
        btn1.setIcon(clienteButtonIcon);
        btn1.setText("F2-Clientes");
        btn1.setPreferredSize(new Dimension(50, 50));
        btn1.setMaximumSize(new Dimension(larguraBotao, alturaBotao));

        JButton btn2 = toolBar.add(actionOrdemServico);
        btn2.setToolTipText("Ordem de Serviço");
        btn2.setIcon(ordemservicoButtonIcon);
        btn2.setActionCommand("ordemservico");
        btn2.setText("F3-Ordem   ");
        btn2.setPreferredSize(new Dimension(50, 50));
        btn2.setMaximumSize(new Dimension(larguraBotao, alturaBotao));

        JButton btn3 = toolBar.add(actionMarcas);
        btn3.setToolTipText("Cadastro de Marcas");
        btn3.setIcon(ordemservicoButtonIcon);
        btn3.setActionCommand("marcas");
        btn3.setText("F4-Marcas  ");
        btn3.setPreferredSize(new Dimension(50, 50));
        btn3.setMaximumSize(new Dimension(larguraBotao, alturaBotao));

        getContentPane().add(toolBar, BorderLayout.NORTH);


        ActionListener fontListener = new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                //    updateMonitor();
            }
        };

        JMenu mFont = new JMenu("Font");
        mFont.setMnemonic('o');

        ButtonGroup group = new ButtonGroup();
        fontMenus = new JMenuItem[FontNames.length];
        for (int k = 0; k < FontNames.length; k++) {
            int m = k + 1;
            fontMenus[k] = new JRadioButtonMenuItem(m + " " + FontNames[k]);
            boolean selected = (k == 0);
            fontMenus[k].setSelected(selected);
            fontMenus[k].setMnemonic('1' + k);
            fontMenus[k].setFont(fonts[k]);
            fontMenus[k].addActionListener(fontListener);
            group.add(fontMenus[k]);
            mFont.add(fontMenus[k]);
        }

        mFont.addSeparator();

        boldMenu.setMnemonic('b');
        Font fn = fonts[1].deriveFont(Font.BOLD);
        boldMenu.setFont(fn);
        boldMenu.setSelected(false);
        boldMenu.addActionListener(fontListener);
        mFont.add(boldMenu);

        italicMenu.setMnemonic('i');
        fn = fonts[1].deriveFont(Font.ITALIC);
        italicMenu.setFont(fn);
        italicMenu.setSelected(false);
        italicMenu.addActionListener(fontListener);
        mFont.add(italicMenu);

        menuBar.add(mFont);

        getContentPane().add(toolBar, BorderLayout.NORTH);

        return menuBar;
    }


    public void acaoBotoes(ActionEvent e) {
        if ("clientes".equals(e.getActionCommand())) { //new
            try {
                //new
                createFrameClientes();
            } catch (Exception ex) {
                Logger.getLogger(FramePrincipal_OK.class.getName()).log(Level.SEVERE, null, ex);
            }
        }

        if ("marcas".equals(e.getActionCommand())) { //new
            try {
                //new
                createFrameMarcas();
            } catch (Exception ex) {
                Logger.getLogger(FramePrincipal_OK.class.getName()).log(Level.SEVERE, null, ex);
            }

        }

        if ("ordemservico".equals(e.getActionCommand())) { //new
            try {
                //new
                createFrameOrdemServico();
            } catch (Exception ex) {
                Logger.getLogger(FramePrincipal_OK.class.getName()).log(Level.SEVERE, null, ex);
            }

        }
        if ("sair".equals(e.getActionCommand())) { //new
            int i = JOptionPane.showOptionDialog(null, "Tem certeza que deseja sair?", "Sair do Sistema", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, JOptionPane.NO_OPTION);
            if (i == JOptionPane.YES_OPTION) {
                quit();
            }
        }

    }

    protected void createFrameClientes() throws PropertyVetoException, Exception {

        if (frameClientes == null) {
            frameClientes = new FrameClientes();
            frameClientes.setVisible(true); //necessary as of 1.3
            desktop.add(frameClientes);
            frameClientes.pack();
            desktop.getDesktopManager().maximizeFrame(frameClientes);
        } else {
            frameClientes.setVisible(true);
        }
        try {
            frameClientes.setSelected(true);
        } catch (java.beans.PropertyVetoException e) {
        }
    }

    protected void createFrameOrdemServico() throws PropertyVetoException, Exception {

        if (frameOrdemServico == null) {
            frameOrdemServico = new FrameOrdemServico();
            frameOrdemServico.setVisible(true); //necessary as of 1.3
            desktop.add(frameOrdemServico);
            frameOrdemServico.pack();
            desktop.getDesktopManager().maximizeFrame(frameOrdemServico);
        } else {
            frameOrdemServico.setVisible(true);
        }
        try {
            frameOrdemServico.setSelected(true);
        } catch (java.beans.PropertyVetoException e) {
        }
    }

    protected void createFrameMarcas() throws PropertyVetoException, Exception {

        if (frameMarcas == null) {
            frameMarcas = new FrameMarcas();
            frameMarcas.setVisible(true);
            desktop.add(frameMarcas);
            frameMarcas.pack();
            desktop.getDesktopManager().maximizeFrame(frameMarcas);
        } else {
            frameMarcas.setVisible(true); //necessary as of 1.3
        }
        try {
            frameMarcas.setSelected(true);
        } catch (java.beans.PropertyVetoException e) {
        }
    }

    protected void quit() {
        int i = JOptionPane.showOptionDialog(null, "Tem certeza que deseja sair?", "Sair do Sistema", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, JOptionPane.NO_OPTION);
        if (i == JOptionPane.YES_OPTION) {
            System.exit(0);
        }
    }

    private static void createAndShowGUI() throws InterruptedException, ClassNotFoundException {
        //Make sure we have nice window decorations.

        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        FramePrincipal farameprincipal = new FramePrincipal();
        farameprincipal.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        farameprincipal.setExtendedState(MAXIMIZED_BOTH);
        //Display the window.
        farameprincipal.setVisible(true);
    }

    private void implementarTeclado() {
        for (int i = 0; i < getContentPane().getComponentCount(); i++) {
            getContentPane().getComponent(i).addKeyListener(this);
        }
    }

    public void F1() {
        System.out.println("Eu fui chamado! VIVA!!!!!!!!");
        JOptionPane.showMessageDialog(null, "Olha o PROMPT!");
    }

    public void listenKeyboard(Component[] cs) {
        for (Component c : cs) {
            c.addKeyListener(this);
        }
    }

    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_F1) {
            F1();
        }
    }

    public void keyReleased(KeyEvent e) {
    }

    public void keyTyped(KeyEvent e) {
    }

    public void actionPerformed(ActionEvent e) {
        if ("clientes".equals(e.getActionCommand())) { //new
            try {
                //new
                createFrameClientes();
            } catch (Exception ex) {
                Logger.getLogger(FramePrincipal_OK.class.getName()).log(Level.SEVERE, null, ex);
            }
        }

        if ("marcas".equals(e.getActionCommand())) { //new
            try {
                //new
                createFrameMarcas();
            } catch (Exception ex) {
                Logger.getLogger(FramePrincipal_OK.class.getName()).log(Level.SEVERE, null, ex);
            }

        }

        if ("ordemservico".equals(e.getActionCommand())) { //new
            try {
                //new
                createFrameOrdemServico();
            } catch (Exception ex) {
                Logger.getLogger(FramePrincipal_OK.class.getName()).log(Level.SEVERE, null, ex);
            }

        }
        if ("sair".equals(e.getActionCommand())) { //new
            int i = JOptionPane.showOptionDialog(null, "Tem certeza que deseja sair?", "Sair do Sistema", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, JOptionPane.NO_OPTION);
            if (i == JOptionPane.YES_OPTION) {
                quit();
            }
        }

//        throw new UnsupportedOperationException("Not supported yet.");
    }
}