JScrollPane.setColumnHeaderView - bottom?

package teste;

import java.awt.Dimension;
import java.awt.Point;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class TesteScrollHeader extends JFrame {
	private static final long serialVersionUID = 1L;

	public TesteScrollHeader() {
		super("TesteScrollHeader");

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		JScrollPane scroll = new JScrollPane();
		JPanel panel = new JPanel() {
			private static final long serialVersionUID = 1L;

			public void paint(java.awt.Graphics g) {
				super.paint(g);
				g.drawLine(0, 0, getWidth(), getHeight());
			};
		};
		JLabel label = new JLabel("header");
		panel.setPreferredSize(new Dimension(640, 480));
		scroll.setPreferredSize(new Dimension(320, 240));
		scroll.setViewportView(panel);
		scroll.setColumnHeaderView(label);
		
		getContentPane().add(scroll);
		pack();
		
		scroll.setLayout(null);
		
		Point p1 = scroll.getViewport().getLocation();
		Point p2 = scroll.getColumnHeader().getLocation();
		Point p3 = scroll.getVerticalScrollBar().getLocation();
		
		p1.y = p2.y;
		p2.y = p1.y + scroll.getViewport().getHeight();
		p3.y = p1.y;
		
		scroll.getViewport().setLocation(p1);
		scroll.getColumnHeader().setLocation(p2);
		scroll.getVerticalScrollBar().setLocation(p3);
	}

	public static void main(String[] args) {
		TesteScrollHeader teste = new TesteScrollHeader();
		teste.setVisible(true);
	}

}