title: Zend Form Radio Default Checked
body: <p>I have the next radio button group:</p>
  
  <pre><code>$enabled = $this-&gt;createElement('radio', 'enabled')
                  -&gt;setLabel('Enabled')
                  -&gt;setMultiOptions(array('1'=&gt;'yes', '0'=&gt;'no'))
                  -&gt;setValue($rank_values['enabled'])
                  -&gt;setAttrib('id', 'enabled')
                  -&gt;setAttrib('class', $action . '_enabled')
                  -&gt;setSeparator('');
  </code></pre>
  
  <p>How can I set a checked radio? Now, when I open my script, there are not selected radio. I want to select 'yes'. How?</p>
  
  <p>Thank you.</p>