title: jLabel.setOpaque(true) does not work
body: <p>I have a jLabel which initially has setOpaque set to false by default. When I set the back ground color of the label to some color and set the setOpaque to true it does not show up the color. Why is it not displaying the color even though the setOpaque is being set to ture?</p>
  
  <p>Here is what I'm trying to do.</p>
  
  <pre><code>JLabel key = values[i];
  key.setBackground(Color.red);
  key.setOpaque(true);
  </code></pre>