Tab.php
public function run()
    {
        $this->registerPlugin('tabs');
        echo Html::beginTag('div', $this->containerOptions);
        echo parent::run();
        echo $this->renderItems($this->items);
        echo Html::endTag('div');
        //return Html::tag($this->tagName, $this->encodeLabel ? Html::encode($this->label) : $this->label, $this->options);
    }
public function run()
    {
        $this->registerPlugin('tabs');
        echo Html::beginTag('div', $this->containerOptions);
        echo parent::run();
        echo $this->renderItems($this->items);
        echo Html::endTag('div');
        //return Html::tag($this->tagName, $this->encodeLabel ? Html::encode($this->label) : $this->label, $this->options);
    }
Renders the widget.