title: web2py - display radio button into my form
body: <p>i want to display a radio button into my from so i did:</p>
  
  <pre><code> SQLField('active',requires=IS_IN_SET(('True','False')),widget=SQLFORM.widgets.radio.widget)
  </code></pre>
  
  <p>but it display an error:</p>
  
  <pre><code>AttributeError: 'NoneType' object has no attribute 'widget'
  </code></pre>
  
  <p>So how can fix it??</p>
  
  <p>Is there any solution to display radio buttons into my from??
  Thanks in advance</p>
  
  <p>Neveen Adel</p>