Bug while removing lastbutton from JToolBar (or removing all)

FULL PRODUCT VERSION :
java version "1.5.0_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_02-b09)
Java HotSpot(TM) Client VM (build 1.5.0_02-b09, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows 2000 Server 5.00.2195

A DESCRIPTION OF THE PROBLEM :
I've got example from Bug ID 4135351 changed import section to make it work on 1.4 release and add the only row toolbar.setPreferredSize(new Dimension(60, 32));.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Press in menu Add JButton 4 times than press Remove JButton

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expected that 4 buttons will be added than one-by-one they 'll be removed.
ACTUAL -
4 buttons added to toolbar 3 buttons remvoved but after removing the last button the picuture of button left on the tool bar while the button actually removed.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * ToolBarTest
 *
 */
public class ToolBarTest extends JFrame {
    JToolBar toolbar;
    
  public ToolBarTest() {
    super("ToolBarTest");
    setSize(500,500);

    JMenuBar jmb = new JMenuBar();
    JMenu addMenu = new JMenu("Add");
    JMenuItem labelItem = new JMenuItem("Add JButton");

    toolbar = new JToolBar();
    toolbar.setPreferredSize(new Dimension(60, 32));

    labelItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
toolbar.add(new JButton("Test"));
getContentPane().validate();
}

    });
    JMenu removeMenu = new JMenu("Remove");
    JMenuItem rItem = new JMenuItem("Remove JButton");
    rItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
toolbar.remove(0);
getContentPane().validate();
}

    });

    addMenu.add(labelItem);
    removeMenu.add(rItem);
    jmb.add(addMenu);
    jmb.add(removeMenu);
    setJMenuBar(jmb);

    getContentPane().add(toolbar, "North");
  }

  public static void main(String args[]) {
      ToolBarTest jc = new ToolBarTest();
      jc.setVisible(true);
  }

}
---------- END SOURCE ----------
###@###.### 2005-03-16 22:02:04 GMT