title: Java Swing, JComboBox drop down list change listener before clicking
body: <p>I have a JComboBox which has a list of midi files, I wonder if the following is doable :
  when I click on the JComboBox, a drop down list opens up, when I move the mouse on to a midi file, it plays a 10 second sample sound, so I know what the file contains <strong>before I click and select that file</strong>, so if I have 50 midi files, I can open the list and move the mouse up and down the list without clicking on it, but still play the 10 second samples from the file the mouse points to, then after I decide which one, click on it, and that one will be the selected one in the JComboBox.</p>
  
  <p>How to get notified for the mouse position change/pointing events from the JComboBox ?</p>