title: Disable JPanel with visual effect
body: <p>I'm looking for a good way to disable a <strong>JPanel</strong>.  I'm using a MVC design for a Java Swing GUI.  I want the <strong>JPanel</strong> to be disabled while the model is processing stuff.  I've tried <strong>setEnabled(false)</strong>.  That disables user input on the <strong>JPanel</strong>, but I'd like it to be grayed out to add a more visual effect.</p>
  
  <p>Thanks in advance!</p>