*
     * A typical basic usage of this method may be : 
     * <pre>
     * PrintService[] services = PrintServiceLookup.lookupPrintServices(
     *                            DocFlavor.INPUT_STREAM.JPEG, null);
     * PrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
     * if (services.length > 0) {
     *    PrintService service =  ServiceUI.printDialog(null, 50, 50,
     *                                               services, services[0],
     *                                               null,
     *                                               attributes);
     *    if (service != null) {
     *     ... print ...
     *    }
     * }
     * </pre>
     * <p>

     * @param gc used to select screen. null means primary or default screen.
     * @param x location of dialog including border in screen coordinates
     * @param y location of dialog including border in screen coordinates
     * @param services to be browsable, must be non-null.
     * @param defaultService - initial PrintService to display.
     * @param flavor - the flavor to be printed, or null.
     * @param attributes on input is the initial application supplied
     * preferences. This cannot be null but may be empty.
     * On output the attributes reflect changes made by the user. 
     * @return print service selected by the user, or null if the user
     * cancelled the dialog.
     * @throws HeadlessException if GraphicsEnvironment.isHeadless()
     * returns true.
     * @throws IllegalArgumentException if services is null or empty,
     * or attributes is null, or the initial PrintService is not in the
     * list of browsable services.
     */
    public static PrintService printDialog(GraphicsConfiguration gc,
                                           int x, int y,
                                           PrintService[] services,
                                           PrintService defaultService,
                                           DocFlavor flavor,
                                           PrintRequestAttributeSet attributes) 
	throws HeadlessException
    {
        int defaultIndex = -1;

        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        } else if ((services == null) || (services.length == 0)) {
            throw new IllegalArgumentException("services must be non-null " +
                                               "and non-empty");
        } else if (attributes == null) {
            throw new IllegalArgumentException("attributes must be non-null");
        } 
        
        if (defaultService != null) {
            for (int i = 0; i < services.length; i++) {
                if (services[i].equals(defaultService)) {
                    defaultIndex = i;
                    break;
                }
            }
            
            if (defaultIndex < 0) {
                throw new IllegalArgumentException("services must contain " +
                                                   "defaultService");
            }
        } else {
            defaultIndex = 0;
        }

	// For now we set owner to null. In the future, it may be passed
	// as an argument. 
	Window owner = null; 
	
	Rectangle gcBounds = (gc == null) ?  GraphicsEnvironment.
	    getLocalGraphicsEnvironment().getDefaultScreenDevice().
	    getDefaultConfiguration().getBounds() : gc.getBounds();

	ServiceDialog dialog;
	if (owner instanceof Frame) {
	    dialog = new ServiceDialog(gc, 
				       x + gcBounds.x, 
				       y + gcBounds.y, 
				       services, defaultIndex,
				       flavor, attributes, 
				       (Frame)owner);
	} else {
	    dialog = new ServiceDialog(gc, 
				       x + gcBounds.x, 
				       y + gcBounds.y, 
				       services, defaultIndex,
				       flavor, attributes, 
				       (Dialog)owner);
	}
	Rectangle dlgBounds = dialog.getBounds();

	// get union of all GC bounds
	GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
	GraphicsDevice[] gs = ge.getScreenDevices();
	for (int j=0; j<gs.length; j++) {