title: Enable/Disable Tab in ActionBar
body: <p>It's possible to enable/disable Tabs in ActionBar?
  With TabHost this is not a problem.. I do:</p>
  
  <pre><code>tabHost.getTabWidget().getChildAt(3).setVisibility(true);
  </code></pre>
  
  <p>and all works.. but if i want to do the same thing with Tabs in ActionBar?? 
  In Tab class don't exist <code>setEnable();</code></p>
  
  <pre><code>ActionBar bar = getActionBar();
  Tab tab =  bar.newTab();
  tab.setText("Test");
  tab.setEnable(false); /*DON'T EXIST!!*/
  </code></pre>
  
  <p>How can I do??</p>