title: Unknown Method - ActiveField::radioButtonList() in Yii2
body: <p>I want to display <code>RadioButton List</code> in form.</p>
  
  <p>I tried using below code:</p>
  
  <pre><code>&lt;?php
  $list = [0 =&gt; 'Morning', 1 =&gt; 'Noon', 2 =&gt; 'Evening'];
  
  /* Display a stacked checkbox list */
  echo $form-&gt;field($model, 'is_active')-&gt;radioButtonList($list);
  ?&gt;
  </code></pre>
  
  <p>But I got error below:</p>
  
  <pre><code>Unknown Method – yii\base\UnknownMethodException
  Calling unknown method: yii\widgets\ActiveField::radioButtonList()
  </code></pre>