package com.seaglasslookandfeel.demo;

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class TestScrollBars {

    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel("com.seaglasslookandfeel.SeaGlassLookAndFeel");
        } catch (Exception e) {
            e.printStackTrace();
        }

        SwingUtilities.invokeLater(new Runnable() {
            public void run() {

                JScrollBar scrollBar = new JScrollBar(JScrollBar.VERTICAL);
                scrollBar.setPreferredSize(new Dimension(15, 300));
                
                JPanel panel = new JPanel();
                panel.add(scrollBar, BorderLayout.CENTER);

                JFrame frame = new JFrame();
                frame.add(panel, BorderLayout.CENTER);
                frame.setSize(275, 125);
                frame.setLocationRelativeTo(null);
                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }

}

package com.seaglasslookandfeel.demo;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class TestScrollBars {

    public static void main(String[] args) {
        if (true) {
            try {
                UIManager.setLookAndFeel("com.seaglasslookandfeel.SeaGlassLookAndFeel");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        SwingUtilities.invokeLater(new Runnable() {
            public void run() {

                JPanel panel = new JPanel();
                panel.setPreferredSize(new Dimension(500, 500));
                panel.setBackground(Color.WHITE);

                JScrollPane scrollPane = new JScrollPane(panel);

                JFrame frame = new JFrame();
                frame.add(scrollPane, BorderLayout.CENTER);
                frame.setSize(275, 125);
                frame.setLocationRelativeTo(null);
                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }

}

Use a scroll pane for the scroll bar test.