Re: Design issue in swing application

package gui;

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

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;

public class WelcomePanel extends JPanel {

   private static final long serialVersionUID = 1596841645688614873L;

   public WelcomePanel(final CenteredGroup inst) {
      this.inst = inst;

      setPreferredSize(new Dimension(480, 100));
      setBorder(new TitledBorder("Start a new session by opening a
BioModel or load a previously saved session"));
      setLayout(new GridBagLayout());

      initButtons();
   }

   private void initButtons() {
      final CenteredGroup inst2 = this.inst;

      b1 = new JButton("Open BioModel");

      b1.addActionListener(new ActionListener() {
            @Override public void actionPerformed(ActionEvent e) {
               inst2.eventOpenBioModel();
            }});

      b2 = new JButton("Load Saved Session");

      b2.addActionListener(new ActionListener() {
            @Override public void actionPerformed(ActionEvent e) {
               inst2.eventLoadSavedSession();
            }});

      addButtonsToGroupPanel(b1, b2);
   }

   private void addButtonsToGroupPanel(JButton b1, JButton b2) {
      GridBagConstraints gbc = new GridBagConstraints();

      gbc.gridx = 0;
      gbc.gridy = 0;
      gbc.gridwidth = 1;
      gbc.gridheight = 1;
      gbc.weightx = 0.5;
      gbc.weighty = 0;
      gbc.anchor = GridBagConstraints.CENTER;
      gbc.fill = GridBagConstraints.NONE;

      add(b1, gbc);

      gbc.gridx = 1;

      add(b2, gbc);
   }

   private CenteredGroup inst = null;

   private JButton b1 = null;
   private JButton b2 = null;
}