netbeans下如何在程序运行时动态添加控件？

Question

package network.temp;
import java.awt.FlowLayout;
import javax.swing.JButton;
public class Move extends javax.swing.JDialog {
    public Move(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
    }
    @SuppressWarnings("unchecked")
    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setName("Form"); // NOI18N
        jPanel1.setName("jPanel1"); // NOI18N
        jPanel1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jPanel1MouseClicked(evt);
            }
        });
        jPanel1.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
            public void mouseDragged(java.awt.event.MouseEvent evt) {
                jPanel1MouseDragged(evt);
            }
            public void mouseMoved(java.awt.event.MouseEvent evt) {
                jPanel1MouseMoved(evt);
            }
        });
        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(network.NetworkApp.class).getContext().getResourceMap(Move.class);
        jButton1.setText(resourceMap.getString("jButton1.text")); // NOI18N
        jButton1.setName("jButton1"); // NOI18N
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(47, 47, 47)
                .addComponent(jButton1)
                .addContainerGap(272, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(63, 63, 63)
                .addComponent(jButton1)
                .addContainerGap(214, Short.MAX_VALUE))
        );        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );        pack();
    }
    private void jPanel1MouseDragged(java.awt.event.MouseEvent evt) {
    }
    private void jPanel1MouseMoved(java.awt.event.MouseEvent evt) {
    }
    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
        JButton b=new JButton("按钮");
        this.getContentPane().add(b);//当点击鼠标时在窗口上动态增加一个按钮
        this.getContentPane().validate();
        this.getContentPane().repaint();
    }    private void jPanel1MouseClicked(java.awt.event.MouseEvent evt) {
    }
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                Move dialog = new Move(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
                dialog.setVisible(true);
            }
        });
    }    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel jPanel1;
    // End of variables declaration//GEN-END:variables}
这个是用netbeans的桌面应用系统建立的一个文件，使用的是netbeans默认的布局管理GroupLayout，当点击jButton1按钮的时候，想动态的添加一个按钮到窗口上，可为什么总也显示不出来呢？

Answer 1

    /**
     * 根据客户端Locale得到本地化字符串.<br>
     * @see {@link org.springframework.context.MessageSource#getMessage(String, Object[], Locale)}
     * @param code 资源Key
     * @param args 参数
     * @return 根据客户端Locale得到的本地化字符串
     */
    public static String resolveMessage(final String code, final Object... args)
    {
        MessageSource messageSource = getMessageSource();        if (messageSource == null)
        {
            LOGGER.error("cannot get messageSource");
            return code;
        }        Locale locale = getClientLocale();
        // LOGGER.debug("resolving message for locale: " + locale);        return messageSource.getMessage(code, args, locale);
    }

Answer 2

/**
     * 根据客户端Locale得到本地化字符串.<br>
     * @see {@link org.springframework.context.MessageSource#getMessage(String, Object[], Locale)}
     * @param code 资源Key
     * @param locale 本地化对象,如果传入null值,默认为server端的本地化对象
     * @param args 参数
     * @return 根据客户端Locale得到的本地化字符串
     */
    public static String resolveMessage(final String code, final Locale locale, final Object... args)
    {
        MessageSource messageSource = getMessageSource();        if (messageSource == null)
        {
            LOGGER.error("cannot get messageSource");
            return code;
        }        Locale targetLocale = locale == null ? Locale.getDefault() : locale;
        // LOGGER.debug("resolving message for locale: " + targetLocale);        return messageSource.getMessage(code, args, targetLocale);
    }    /**
     * 获取客户端的locale.<br>
     * @return 客户端的locale
     */
    public static Locale getClientLocale()
    {
        return LocaleContextHolder.getLocale();
    }

Answer 3

  Timer timer = new Timer();
        timer.setParent(comp);
        timer.addEventListener("onTimer", new EventListener(){            public void onEvent(final Event arg0) throws Exception
            {
                Timer timer =(Timer) arg0.getTarget();
                timer.setDelay(flush_time);
                showPic();
                timer.setRepeats(true);
                timer.setRunning(true);            }});