title: Change color of Sencha Touch Ext.TabPanel
body: <pre><code>new Ext.TabPanel({
              fullscreen: true,
              cardSwitchAnimation: 'slide',
              ui: 'dark',
              items: [home, about]
          });
  </code></pre>
  
  <p>For the <code>ui</code>, can I specify like, a color instead of dark and light? How can I make it a specific color or background image of our choice?</p>
  
  <p>Thanks.</p>