title: GWT TabPanel CSS style with image
body: <p>I have some panel in my project and I can't change the default style of it (light Blue) - I want image in the tab. I follow several tutorials but can't find it out.</p>
  
  <p>Please help me out how to do it?</p>
  
  <pre><code>TabPanel tabPanel = new TabPanel();
  
  Panel controlPanel = new Panel("Discovery");
  
  tabPanel.add(controlPanel);
  </code></pre>
  
  <p>... and I have both my project css and custom css.</p>
  
  <p>Where we change css so modify our tab panel?</p>