GUI for Selenium web testing

I am wanting to build web-based testing tools for test website environments utilizing the Selenium Web Driver. I am building a GUI which will contain the following: Drop-down for selecting the website, toggle button for selecting the testing environment and a button for launching the specified browser you wish to test the previous criteria in. The drop-down for the website and the toggles will dynamically build a URL based off of the choices (not currently in this code).

Example: I pick Google, then toggle I want to test on TestEnv1 and I want the program to launch the website on env1 using Firefox.

Future goals:

Drop-down implementation that can read the tests that are to be auto-ran which will have selenium tests created for them. This drop-down would be incorporated to allow nearly full-automation for testing.

After creating my mock-up GUI and putting in some sample code my current version looks something similar to:

package automationFramework;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.JFrame;
import javax.swing.JComboBox;
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JRadioButton;
import javax.swing.JToggleButton;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.DefaultButtonModel;
import javax.swing.DefaultComboBoxModel;

public class Dynamic_Browser_and_Site {

    private JFrame frame;
    public int n;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Dynamic_Browser_and_Site window = new Dynamic_Browser_and_Site();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public Dynamic_Browser_and_Site() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 500, 250);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        // Site Drop-Down
        JComboBox siteList = new JComboBox();
        siteList.setToolTipText("Choose the website you would like to begin testing on.");
        siteList.setModel(new DefaultComboBoxModel(new String[] {"\"Choose your site...\"", "Google", "Yahoo", "Microsoft", "Apple"}));
        siteList.setMaximumRowCount(5);
        siteList.setBounds(0, 0, 484, 20);
        frame.getContentPane().add(siteList);

        // Browser Buttons
        JButton btnFF = new JButton("Firefox");
        btnFF.setBounds(10, 146, 125, 55);
        frame.getContentPane().add(btnFF);
        btnFF.setEnabled(false);

        JButton btnIE = new JButton("Internet Explorer");
        btnIE.setBounds(349, 146, 125, 55);
        frame.getContentPane().add(btnIE);
        btnIE.setEnabled(false);

        JButton btnCH = new JButton("Chrome");
        btnCH.setBounds(180, 146, 125, 55);
        frame.getContentPane().add(btnCH);
        btnCH.setEnabled(false);

        // Toggle Buttons
        JToggleButton tglbtnEnv1 = new JToggleButton("TestEnv1");
        tglbtnEnv1.setBounds(10, 65, 90, 55);
        frame.getContentPane().add(tglbtnEnv1);

        JToggleButton tglbtnEnv2 = new JToggleButton("TestEnv2");
        tglbtnEnv2.setBounds(135, 65, 90, 55);
        frame.getContentPane().add(tglbtnEnv2);

        JToggleButton tglbtnEnv3 = new JToggleButton("TestEnv3");
        tglbtnEnv3.setBounds(260, 65, 90, 55);
        frame.getContentPane().add(tglbtnEnv3);

        JToggleButton tglbtnEnv4 = new JToggleButton("TestEnv4");
        tglbtnEnv4.setBounds(384, 65, 90, 55);
        frame.getContentPane().add(tglbtnEnv4);

        // Button Group Array for toggling environments
        ButtonGroup group = new ButtonGroup();
        group.add(tglbtnEnv1);
        group.add(tglbtnEnv2);
        group.add(tglbtnEnv3);
        group.add(tglbtnEnv4);
        // System.out.println(tglbtnEnv1.getAction());


        // TestEnv1 toggle prompt
        tglbtnEnv1.addItemListener(new ItemListener() {
           public void itemStateChanged(ItemEvent ev) {
              if(ev.getStateChange()==ItemEvent.SELECTED){
                  System.out.println(tglbtnEnv1.getActionCommand( ));
                  System.out.println("button is selected");

                  // Toggle browser buttons
                  btnFF.setEnabled(true);
                  btnCH.setEnabled(true);
                  btnIE.setEnabled(true);
                  System.out.println("Firefox button enabled");
                  System.out.println("Chrome button enabled");
                  System.out.println("Internet Explorer button enabled");
              } else{
                System.out.println("button is not selected");
              }
           }
        });

        // TestEnv2 toggle prompt
        tglbtnEnv2.addItemListener(new ItemListener() {
           public void itemStateChanged(ItemEvent ev) {
              if(ev.getStateChange()==ItemEvent.SELECTED){
                  System.out.println(tglbtnEnv2.getActionCommand( ));
                  System.out.println("button is selected");

                  // Toggle browser buttons
                  btnFF.setEnabled(true);
                  btnCH.setEnabled(true);
                  btnIE.setEnabled(true);
                  System.out.println("Firefox button enabled");
                  System.out.println("Chrome button enabled");
                  System.out.println("Internet Explorer button enabled");
              } else{
                System.out.println("button is not selected");
              }
           }
        });

        // TestEnv3 toggle prompt
        tglbtnEnv3.addItemListener(new ItemListener() {
           public void itemStateChanged(ItemEvent ev) {
              if(ev.getStateChange()==ItemEvent.SELECTED){
                  System.out.println(tglbtnEnv3.getActionCommand( ));
                  System.out.println("button is selected");

                  // Toggle browser buttons
                  btnFF.setEnabled(true);
                  btnCH.setEnabled(true);
                  btnIE.setEnabled(true);
                  System.out.println("Firefox button enabled");
                  System.out.println("Chrome button enabled");
                  System.out.println("Internet Explorer button enabled");
              } else{
                System.out.println("button is not selected");
              }
           }
        });

        // TestEnv4 toggle prompt
        tglbtnEnv4.addItemListener(new ItemListener() {
           public void itemStateChanged(ItemEvent ev) {
              if(ev.getStateChange()==ItemEvent.SELECTED){
                  System.out.println(tglbtnEnv4.getActionCommand( ));
                  System.out.println("button is selected");

                  // Toggle browser buttons
                  btnFF.setEnabled(true);
                  btnCH.setEnabled(true);
                  btnIE.setEnabled(true);
                  System.out.println("Firefox button enabled");
                  System.out.println("Chrome button enabled");
                  System.out.println("Internet Explorer button enabled");
              } else{
                System.out.println("button is not selected");
              }
           }
        });     
    }
}

I am wanting to know of any concerns or tips to further improve and optimize this code.