title: yii booster checkbox doesn't show boxes to check
body: <p>I add the checkbox functionality from the <a href="http://yiibooster.clevertech.biz/extended-grid.html" rel="nofollow">yii-booster</a>. But the widget renders the model view without the needed boxes. What's wrong?</p>
  
  <p><strong>Widjet code in view</strong></p>
  
  <pre><code>&lt;?php
  $this-&gt;widget('bootstrap.widgets.TbExtendedGridView',array(
  'id'=&gt;'docs-grid',
  'dataProvider'=&gt;$model-&gt;search(),
  'filter'=&gt;$model,
  'type'=&gt;'bordered condensed',
  'template' =&gt; "{items}",
  'bulkActions' =&gt; array(
      'actionButtons' =&gt; array(
          array(
                  'buttonType' =&gt; 'button',
                  'type' =&gt; 'primary',
                  'size' =&gt; 'small',
                  'label' =&gt; 'Choose',
                  'click' =&gt; 'js:function(values){console.log(values);}'
                  )
              ),
              // if grid doesn't have a checkbox column type, it will attach
              // one and this configuration will be part of it
          'checkBoxColumnConfig' =&gt; array(
          'name' =&gt; 'id'
          ), 
    ),    
  ));
  </code></pre>