title: How to add a popup menu to a JTextField
body: <p>Can anybody explain me how to add a popup menu at a JtextField? I managed to add a JPopupMenu:</p>
  
  <pre><code>JPopupMenu popup = new JPopupMenu();
      popup.add("m");
  popup.add("n"); 
  
  JTextField textField = new JTextField();
  textField.add(popup);
  </code></pre>
  
  <p>.....</p>
  
  <p>But when i roll the mouse over "popup", nothing is happening (i need to select an item from popup).</p>