java - 親 JFrame が最大化された状態で JPopupMenu を閉じる際の問題

Question

JFrame と、クリック イベントで JPopupMenu を開くボタンがあります。この JPopupMenu には、ボタンを含む JPanel があります。このボタンは、JPopupMenu を破棄することになっています。JFrame が最大化されていない限り、これは実行されます。ただし、JFrame が最大化されると、Jframe 自体が閉じられます。

この問題を解決するための助けや指針をいただければ幸いです。

(私はこれを開発するために netbeans を使用しています。)

//Demo.Java

public class Demo extends javax.swing.JFrame {
    public JPopupMenu menu1;

    public Demo() {
        initComponents();
        menu1 = new JPopupMenu();
        menu1.add(new MyJPanel());    
    }

    @SuppressWarnings("unchecked")
    private void initComponents() {
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("Open JPopupMenu");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(53, 53, 53)
                .addComponent(jButton1)
                .addContainerGap(224, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(85, 85, 85)
                .addComponent(jButton1)
                .addContainerGap(192, Short.MAX_VALUE))
        );

        pack();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        menu1.show(jButton1,0,0);
    }                                        

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Demo().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    // End of variables declaration                   
}

以下は MyJpanel のコードです。

// MyJPanel.java
package demo;

import java.awt.Window;
import javax.swing.SwingUtilities;

public class MyJPanel extends javax.swing.JPanel {
    public MyJPanel() {
        initComponents();
    }
    @SuppressWarnings("unchecked")
    private void initComponents() {

        jTabbedPane1 = new javax.swing.JTabbedPane();
        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jPanel2 = new javax.swing.JPanel();

        jButton1.setText("Close jPopupMenu");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(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(82, 82, 82)
                .addComponent(jButton1)
                .addContainerGap(192, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(122, 122, 122)
                .addComponent(jButton1)
                .addContainerGap(127, Short.MAX_VALUE))
        );

        jButton1.getAccessibleContext().setAccessibleName("closeParent");

        jTabbedPane1.addTab("tab1", jPanel1);

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 395, Short.MAX_VALUE)
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 272, Short.MAX_VALUE)
        );

        jTabbedPane1.addTab("tab2", jPanel2);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jTabbedPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jTabbedPane1)
        );
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        Window w = SwingUtilities.getWindowAncestor(MyJPanel.this);
        w.dispose();
    }                                        

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JTabbedPane jTabbedPane1;
    // End of variables declaration                   


}