Disabled the call to setDefaultCloseOperation method

Comment indicators were used to disable the call to the setDefaultCloseOperation method as shown in Listing 2.

This code was replaced by code that you will see later

• that causes the JFrame to do nothing
• when the X-button on the PictureExplorer object is clicked.

/*Disabled by Baldwin on 5/15/12
   pictureFrame.setDefaultCloseOperation(
                                 JFrame.DISPOSE_ON_CLOSE);
*/