design help

looks big, but the question context is in "passing object references only by value"

                  PCPanel1 p1 = new PCPanel1(data1);
                  p1.addComp2();
i have trouble passing the PCMainPanel object also here so that it can be called back by the back button using the reference (oops...reference passed by value..)

how to acheive this without creating one more instance or clone()
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package com.samples.testmemory;

import javax.swing.*;
import java.awt.*;
import java.beans.*;
import java.io.*;

public class PCApp
{

  public static PCFrame frame;

  public PCApp()
  {
        try
        {
          jbInit();
        }
        catch(Exception e)
        {
          e.printStackTrace();
        }
  }

  private void jbInit() throws Exception
  {
      frame = (PCFrame) Beans.instantiate(getClass().getClassLoader(), PCFrame.class.getName());

      frame.setVisible(true);
      frame.setStatusText2("");
      frame.setStatusText3("");

      frame.setTitle("Passing reference by value test ");
      frame.toFront();
      frame.setVisible(true);
      frame.requestFocus();

      System.out.println("App class jbInit()");
  }

  public void RunProg()
  {
      //if all property file , connections correct
      System.out.println("App class runProg()");
      frame.RunProg();
  }

  public static void main(String[] args)
  {
      //security checking
      System.out.println("Main method");
      PCApp a1 = new PCApp();
      a1.RunProg();
  }

}
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package com.samples.testmemory;

import com.samples.beans.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

import com.samples.testmemory.*;

public class PCFrame extends LayoutBean
{
  private PCMainPanel mainPanelClass;
  private PCData DataClass;

  public PCFrame()
  {
        try  {
          jbInit();
        }
        catch(Exception e) {
          System.out.println("Exception: " + e.getMessage());
        }
  }

  private void jbInit() throws Exception
  {
      System.out.println("App class jbInit()");
  }

  public void RunProg()
  {
      //if all property file , connections correct
        try
        {
            DataClass = new PCData("test", "conn");
            System.out.println("Frame class RunProg()");
            launchMainPanel();
        }
        catch (Exception e)
        {
            JOptionPane.showMessageDialog(this, "Error retreiving data. See error log.");
        }
  }

  public void launchMainPanel()
  {
      System.out.println("Launch main panel");
      mainPanelClass = new PCMainPanel(DataClass);
      mainPanelClass.addComp1();
  }
}

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package com.samples.testmemory;

public class PCData
{
  private String dbconn;
  private String dbname;

  public PCData(String databaseName, String conn)
  {
        System.out.println("Data constructor()");
        dbconn = conn;
        dbname = databaseName;
  }
}
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package com.samples.testmemory;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class PCMainPanel
{
  private PCFrame frame1;
  private PCData data1;

  private JPanel panel1;
  private JButton btnDetails;

  public PCMainPanel(PCData data)
  {
      data1 = data;
      try {
          jbInit();
      }
      catch(Exception e) {
          e.printStackTrace();
      }
  }

    public void jbInit() throws Exception  {
    }

    public void addComp1() {

          PCApp.frame.getMasterPanel().removeAll();

          panel1 = new JPanel();
          panel1.add(new JLabel("screen1"));

          btnDetails = new JButton("Claim Details");
          btnDetails.setPreferredSize(new Dimension(110, 22));
          btnDetails.setMinimumSize(new Dimension(110, 22));

          btnDetails.addActionListener(new ActionListener ()
          {
              public void actionPerformed(ActionEvent e)
              {
                  PCPanel1 p1 = new PCPanel1(data1);
                  p1.addComp2();
              }
          });

          panel1.add(btnDetails);

          PCApp.frame.getMasterPanel().add(panel1);
          PCApp.frame.repaint();
          PCApp.frame.validate();
    }
}

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package com.samples.testmemory;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class PCPanel1
{
  private PCFrame frame1;
  private PCData data1;
  private PCMainPanel mainPanel;

  private JPanel panel1;
  private JButton btnBack;

  public PCPanel1(PCData data)
  {
    data1 = data;
  }

  public PCPanel1(PCData data, PCMainPanel PCPanel)
  {
      data1 = data;
      mainPanel = PCPanel;
      try {
          jbInit();
      }
      catch(Exception e) {
          e.printStackTrace();
      }
  }

    public void jbInit() throws Exception  {
    }

    public void addComp2() {
          panel1 = new JPanel();
          panel1.add(new JLabel("screen2"));

          btnBack = new JButton(" Back ");
          btnBack.setPreferredSize(new Dimension(110, 22));
          btnBack.setMinimumSize(new Dimension(110, 22));
          btnBack.addActionListener(new ActionListener ()
          {
              public void actionPerformed(ActionEvent e)
              {
                  mainPanel.addComp1();
              }
          });

          panel1.add(btnBack);

          PCApp.frame.getMasterPanel().add(panel1);
          PCApp.frame.repaint();
          PCApp.frame.validate();
    }
}
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