OK.  So far so good...

now ..this is where you lose me.

But, because I am feeling particularly magnanimous
at the moment, I thought I'd throw together my
*own* exmple, that shows my current understanding
(or not) of your problem requirement..

<sscce>
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** A simple example that demontrates my (almost
complete) lack of understanding of the question. ;-) */
public class FlipTab extends JFrame
  implements ActionListener {

  /* The tabbed pane at the heart of it. */
  JTabbedPane jtp;

  /** Content panel of the tabbed pane */
  JPanel page1, page2, page3;

  /** Button to control UI */
  JButton b1, b2;

  /** Counter for the labels*/
  int count;

  /** A tabbed pane with three content tabs. */
  FlipTab() {
     super("Flip Tabs");

     jtp = new JTabbedPane();
     add( jtp );

     page1 = new JPanel();
     b1 = new JButton("Button 1");
     b1.addActionListener(this);
     page1.add( b1 );

     jtp.add( page1, "page1" );

     page2 = new JPanel();
     jtp.add( page2, "page2" );

     page3 = new JPanel();
     jtp.add( page3, "page3" );

     add(jtp);

     pack();
     setSize( getPreferredSize() );

     count = 0;
  }

  /** On button one, make and flip to button 2.
  On button two, add another label to tabbed pane 3. */
  public void actionPerformed(ActionEvent ae) {
     Object o = ae.getSource();
     if ( o==b1 ) {
        if (b2==null) {
           b2 = new JButton("Button 2");
           b2.addActionListener(this);
           page2.add( b2 );
           jtp.setSelectedComponent( b2.getParent() );
        }
     } else { // must be b2
        JLabel l1 = new JLabel("Heyoo! .." + ++count);
        page3.add( l1 );
        jtp.setSelectedComponent( l1.getParent() );
     }
     validate();
  }

  /** Gimme' it. Now! */
  public static void main(String [] args) {
     FlipTab f = new FlipTab();

     f.setVisible(true);
  }
}
</sscce>

?