REGRESSION
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Appearance changed in JDK 6 (same in JDK 7).
  
SYNOPSIS
--------
Regression: RadioButton custom colours not behaving as expected

JDK VERSION
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Java 6 (tested with 6u26)
JDK 7 (tested with b147)
Not reproducible with 5.0

DESCRIPTION
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When creating a custom look and feel for radio buttons, the RadioButton.foreground key/value seems to override the RadioButtonMenuItem.disabledForeground key/value. For example, if we set RadioButtonMenuItem.disabledForeground grey, and RadioButton.foreground to black, disabled radio buttons appear black rather than grey. This did not happen with 5.0 - in 5.0 the RadioButtonMenuItem.disabledForeground key/value seems to take precedence.

REPRODUCTION INSTRUCTIONS
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Compile and run the attached testcase

Expected behaviour (seen with 5.0):
   The disabled radio button label ("Button 2") should be grey

Observed behaviour (seen with Java 6 and JDK 7):
   The disabled radio button label ("Button 2") is black

TESTCASE
--------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.sun.java.swing.plaf.windows.WindowsLookAndFeel;

public class SimplifiedTest {
   public static void main(String args[]) throws Exception {
       JFrame frame = new JFrame();
       frame.setTitle("SimplifiedTest");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
       UIManager.setLookAndFeel(new MyLookAndFeel());
       
       JRadioButton button1 = new JRadioButton("Button 1");
       JRadioButton button2 = new JRadioButton("Button 2");
       button2.setEnabled(false);

       JPanel mainPanel = new JPanel();
       mainPanel.setLayout(new GridLayout(2,1));
       mainPanel.add(button1);
       mainPanel.add(button2);

       frame.add(mainPanel);
       frame.pack();
       frame.setVisible(true);
   }
}

class MyLookAndFeel extends WindowsLookAndFeel {
   protected void initComponentDefaults(UIDefaults table) {
       super.initComponentDefaults(table);

       Object[] defaults = {
                           "RadioButton.foreground", Color.BLACK, // comment this line out and the problem disappears
                   "RadioButtonMenuItem.foreground", Color.BLACK,
           "RadioButtonMenuItem.disabledForeground", Color.GRAY,
       };

       table.putDefaults(defaults);
   }
}