title: How to display frame within menu options window
body: <p>I am developing a Java application using Swing.  I am using menu bar in my application.  Whenever I click a menu item I need to open a new panel/frame within the window containing menu options.</p>
  
  <p>To be precise I don't want to open a new window on clicking a menu item.  What is the possible solution to this problem?</p>
  
  <p>Thanks in advance. </p>