src/widget/Callout.php
public function init()
    {
        parent::init();

        $this->initOptions();

        echo Html::beginTag('div', $this->options) . "\n";
        echo $this->renderHeaderBegin() . "\n";
    }
public function init()
    {
        parent::init();

        $this->initOptions();

        echo Html::beginTag('div', $this->options) . "\n";
        echo $this->renderHeaderBegin() . "\n";
    }
Initializes the widget.