broken color for disabled combo box's trigger arrorw, and some element surface

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

/**
 *
 * The background color is erroneous for a disabled combo box's trigger
 * arrow, and element surronding surface in the Motif, and the Metal
 * Look and Feel (j2se 1.4.0 beta 2)
 *
 * However, the Windows L&F behavior was handled appropriately through the bug#4250958 fix.
 *
 *
 **/
public class Test extends JFrame {


    Test(String laf, int location_x, int location_y, int size_x, int size_y, boolean isWorkAround) {
        super();
        String title = laf.substring(laf.lastIndexOf('.')+1);
        title = isWorkAround ? title + " - With workaround": title;
        setTitle (title);
        this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);

        Container content = this.getContentPane();
        content.setLayout(new BoxLayout (content, BoxLayout.Y_AXIS));

        this.setBounds (location_x, location_y, size_x, size_y);
        if (laf != null) {
          try {
            UIManager.setLookAndFeel(laf);
          } catch (Exception e ) {
            System.err.println ("Test.Test(): " + e);
          }
        }

        // create the content for the 2 used cumbo boxes.
        Vector items = new Vector();
        items.add("first");
        items.add("second");
        items.add("third");
        items.add("fourth");


      // To change the current Look and Feel for all the JComboBox components,
      // one needs to negotiate with the UIManager.

          // Note that the background and foreground colors for a
          // disabled combo box can only be handled via UIManager
        UIManager.put ("ComboBox.disabledBackground", Color.cyan);
        UIManager.put ("ComboBox.disabledForeground", Color.white);
          // Although the individual component allows us to
          // change the foreground and background colors we
          // will start with known initial colors
        UIManager.put ("ComboBox.background", Color.blue);
        UIManager.put ("ComboBox.foreground", Color.magenta);

      // create the disabled cyan combo box.
        JComboBox combo = new JComboBox(items);



// Adding this following lines works around the misfit background color
// for the disabled combo box's trigger arrow, and element surronding
// surface in the Motif, and the Metal Look and Feel (j2se 1.4.0 beta 2):
if (isWorkAround == true) {
    combo.setBackground(Color.cyan);
}

        combo.setEnabled(false);
        content.add(combo);


  // create the enabled cyan combo box.
        combo = new JComboBox(items);
        combo.setBackground(Color.cyan);
        combo.setForeground(Color.magenta);

        content.add(combo);

  // Add a test button to highlight bug#4250958 behavior in j2se 1.3.x
        UIManager.put ("Button.background", Color.red);
        UIManager.put ("Button.foreground", Color.yellow);

        JButton testButton = new JButton();
        testButton.setText("for bug#4250958 in 1.3.x");
        testButton.setAlignmentX(Component.CENTER_ALIGNMENT);
        content.add(testButton);
    }


    public static void main(String args[]) {

      int origin_x = 5;
      int origin_y = 5;
      int size_x = 300;
      int size_y =108;
      int gap =5;

      Test testPanel = new Test("com.sun.java.swing.plaf.windows.WindowsLookAndFeel", origin_x, origin_y, size_x, size_y, false);
      testPanel.setVisible(true);
           testPanel = new Test("com.sun.java.swing.plaf.motif.MotifLookAndFeel", (origin_x+size_x+gap), origin_y, size_x, size_y, false);
      testPanel.setVisible(true);
           testPanel = new Test("javax.swing.plaf.metal.MetalLookAndFeel", (origin_x+2*size_x+2*gap), origin_y, size_x, size_y, false);
      testPanel.setVisible(true);

                 testPanel = new Test("com.sun.java.swing.plaf.motif.MotifLookAndFeel", (origin_x+size_x+gap), (origin_y+size_y+gap), size_x, size_y, true);
      testPanel.setVisible(true);
           testPanel = new Test("javax.swing.plaf.metal.MetalLookAndFeel", (origin_x+2*size_x+2*gap),(origin_y+size_y+gap), size_x, size_y, true);
      testPanel.setVisible(true);

    }
}