This is what I meant:

```php
echo Tabs::widget(array(
    'options' => array('class'=>'nav-tabs'),
    'items' => array(
        array(
            'header' => 'One',
            'content' => 'Anim pariatur cliche...',
        ),
        array(
            'header' => 'Dropdown',
            'content' => new DropDown(array(
                 'items' => '...',
            )),
        ),
    ),
));
```

When seeing a `Dropdown` object, you will get its rendering result, decorate it as needed, and then assign to `content`.