Re: Adding Component above all other components

My initial problem is to put the panel (which is created as a result
of a click on a button) above all components that have been added to
the GBLTablePanel. I've written the following sample that demonstrates
my problem

package test;

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.WindowConstants;
import javax.swing.table.DefaultTableModel;

public class GBLTablePanel extends JPanel {
    private final GridBagLayout layout;
    private final GridBagConstraints gbc;

    public GBLTablePanel() {
        layout = new GridBagLayout();
        gbc = new GridBagConstraints();
        setLayout(layout);

        JTable table = new JTable();

        table.setModel(new DefaultTableModel(new Object[][] {
                { "aaaaaaaaaaaaaaa", 3, "a", null }, { "adasda", 10, "b", null },
                { "aaaaaaaaaaaaaaa", 3, "a", null }, { "adasda", 10, "b", null },
                { "aaaaaaaaaaaaaaa", 3, "a", null }, { "adasda", 10, "b", null },
                { "aaaaaaaaaaaaaaa", 3, "a", null }, { "adasda", 10, "b", null },
                { "assssss", 55, "c", null }, { "asdafasfa", 44, "d", null } },
                new String[] { "Title 1", "Title 2", "Title 3", "Title 4" }));

        JScrollPane scrollPane = new JScrollPane(table);

        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.fill = GridBagConstraints.BOTH;
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        layout.setConstraints(scrollPane, gbc);

        add(scrollPane);

        JButton showPanelBtn = new JButton(new AbstractAction("Show panel") {
            @Override
            public void actionPerformed(ActionEvent e) {

                /* When this button is clicked I want that panel to appear on the
top (above all components of the GBLTablePanel ) */
                JPanel panel = new JPanel();
                panel.add(new JLabel("This must be on the top of JTable"));
                panel.setSize(panel.getSize().width, 30);
                panel.setPreferredSize(new Dimension(panel.getPreferredSize().width,
30));

                layout.setConstraints(panel, gbc);
                gbc.gridy = 0;
                GBLTablePanel.this.add(panel, 0);
            }
        });

        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.gridy = 1;
        layout.setConstraints(scrollPane, gbc);
        add(showPanelBtn);
    }

    public static void main(String[] args) {
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        /* Construct table managed by GridBagLayout */
        GBLTablePanel panel = new GBLTablePanel();
        f.add(panel);
        f.pack();
        f.setVisible(true);
    }

}

I hope the example is not too confusing, honestly I'm not sure what do
I try next to fix my problem. The panel simply does not show up :(