With the Motif L&F, JTabbedPane.setBackgroundAt() does not work.

The following application attempts to display one tab out of 5 with
a blue background. When the app is executed, the tab is displayed with
the default background, and not with the expected blue background.
==========================================================================

/*
 * tabTest.java
 * Motif L&F: JTabbedPane.setBackgroundAt() does not work
 *
*/

import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;

public class tabTest extends JFrame {

  JTabbedPane tabbedPane;
  
  public tabTest()
    {
      
      tabbedPane = new JTabbedPane();
      for (int i = 0; i < 5; i++)
{
JPanel panel = new JPanel();
panel.add(new JLabel("The tab titled 'Tab2' should have a blue background."));
tabbedPane.addTab("Tab" + i, panel);
}

      tabbedPane.setSelectedIndex(3);
      tabbedPane.setBackgroundAt(2,Color.blue);
      tabbedPane.setForegroundAt(1,Color.green);
      
      getContentPane().setLayout(new BorderLayout());
      getContentPane().add("Center", tabbedPane);
    }

  public static void main(String[] args)
    {
      tabTest frame = new tabTest();
      frame.pack();
      frame.setSize(450,350);
      frame.show();
    }
  
}