Problema con più JPanel

Salve gente il mio problema è il seguente:

ho un button contenuto in un JFrame, al click su questo button sul JFrame appare un piccolo JPanel (che fa da menu) dentro il quale si trova un altro button, al click su questo button dovrebbe comparire un secondo JPanel che ,questa volta,dovrebbe coprire tutto il contenuto del JFrame, tuttavia quest'ultimo JPanel mi compare dentro il JPanel che fa da menu...
Come potrei fare per fare in modo che effettivamente copra tutto il JFrame?

Allego il sorgente, generato con Netbeans, per chiarire meglio il problema:
JFrame:

package test;

public class JF extends javax.swing.JFrame {
    P1 p1 = new P1();
    public JF() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("Menu");
        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(50, 50, 50)
                .addComponent(jButton1)
                .addContainerGap(291, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(113, 113, 113)
                .addComponent(jButton1)
                .addContainerGap(164, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        this.add(p1);
        p1.validate();
        p1.repaint();
    }                                        

    public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new JF().setVisible(true);
            }
        });
    }


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

JPanel1 (menu):

package test;

public class P1 extends javax.swing.JPanel {
    P2 p2 = new P2();
    public P1() {
        initComponents();
        this.setLocation(300, 50);
        this.setSize(100, 200);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton1 = new javax.swing.JButton();

        setBackground(new java.awt.Color(255, 102, 0));

        jButton1.setText("Avvia");
        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(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jButton1)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(31, 31, 31)
                .addComponent(jButton1)
                .addContainerGap(146, Short.MAX_VALUE))
        );
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        this.add(p2);
        p2.validate();
        p2.repaint();
    }                                        


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

JPanel2:

package test;

public class P2 extends javax.swing.JPanel {
    public P2() {
        initComponents();
        this.setSize(100, 100);
        this.setLocation(0, 0);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        setBackground(new java.awt.Color(255, 0, 0));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );
    }// </editor-fold>                        

    // Variables declaration - do not modify                     
    // End of variables declaration                   
}

Grazie per gli eventuali suggerimenti