e750. adding a disabled icon to a jbutton component.txt

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By default, when a button is disabled, it automatically generates a grayed-out version of the installed icon. However, it is possible to set a specific icon to use when the button is disabled. 
    // To create a button with an icon, see e746 Adding an Icon to a JButton Component
    
    // Icon will appear gray
    button.setEnabled(false);
    
    // Set a disabled version of icon
    Icon disabledIcon = new ImageIcon("dicon.gif");
    button.setDisabledIcon(disabledIcon);
    
    // To remove the disabled version of the icon, set to null
    button.setDisabledIcon(null);
    
    // If original icon is set as the disabled icon, disabling
    // the button will have no effect on the icon
    button.setDisabledIcon(icon);

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