button with nested ul clases yii framework
<p>I would like to this, but with yii framework:</p>

<pre><code> &lt;span class="btn default btn-file"&gt;
    &lt;span class="fileinput-new"&gt;Select image&lt;/span&gt;
    &lt;span class="fileinput-exists"&gt;Change&lt;/span&gt;
    &lt;input type="file" name="..."&gt;&lt;/input&gt;
 &lt;/span&gt;
</code></pre>

<p>trying to do this way but doesn't work;</p>

<pre><code>echo Button::widget([
    'label' =&gt; 'Select Image',
    'options' =&gt; ['class' =&gt; 'btn default btn-file'],
    'options' =&gt; ['class' =&gt; 'fileinput-new'],
]);
</code></pre>

<p>I'm very newbie in yii framework and I've been spending some time trying to do this but without success. Anyhelp would be very apreciated</p>