title: How can I change the arrow style in a JComboBox
body: <p>Let's say I want to use a custom image for the arrow in JComboBox, how can I do this? </p>
  
  <p>I understand it's possible using the synth xml files, or maybe even UIManager.put(...), but I don't know how. All I want to do at this time is change the arrow image to something else, either programatically or even just overriding the image it uses. How exactly can I do this?</p>