title: How to set the title of a JComboBox when nothing is selected?
body: <p>I want to have a JCombobox in my Swing application, which shows the title when nothing is selected. Something like this:</p>
  
  <blockquote>
    <p>COUNTRY ▼<br>
    Spain<br>
    Germany<br>
    Ireland  </p>
  </blockquote>
  
  <p>I want "COUNTRY" to show when the selected index is -1 and thus, the user wouldn't be able to select it. I tried to put it on the first slot and then overriding the ListCellRenderer so the first element appears greyed out, and handling the events so when trying to select the "title", it selects the first actual element, but I think this is a dirty approach.</p>
  
  <p>Could you lend me a hand?</p>