JScrollPane track the component that is focused

I have a screen with JSrollPane and several JTextFields . When changing textfield using the tab key, JScrollPane does not match if the textfield that receives the focus is "down the screen."

I wanted it when I shifted the focus to a textfield that was not appearing, the JScrollPane followed and went down or up depending on which textfield I changed the focus.

Code to generate the screen, it is a very simple screen with only the same textfield:

package newpackage;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JScrollPane;
import javax.swing.JTextField;

public class GridLayoutButtonsTest extends JFrame {

    private JPanel contentPane;
    private int qtButton = 0;

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

    public GridLayoutButtonsTest() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(500, 200));
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);

        JScrollPane scroll = new JScrollPane();
        scroll.setPreferredSize(new Dimension(464, 139));

        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(0, 1, 10, 10));

        for (int i = 0; i < 15; i++) {
            panel.add(gerarField());
        }
        scroll.setViewportView(panel);
        contentPane.add(scroll);

        pack();
    }

    public JTextField gerarField() {
        qtButton++;
        JTextField NewField = new JTextField(String.valueOf(qtButton));
        return NewField;
    }
}