whmcsKerioEmail/core/UI/Widget/TabsWidget/TabsWidget.php

<?php

namespace ThurData\Servers\KerioEmail\Core\UI\Widget\TabsWidget;

use \ThurData\Servers\KerioEmail\Core\UI\Builder\BaseContainer;

class TabsWidget extends BaseContainer
{
    protected $id = 'tabsWidget';
    protected $name = 'tabsWidget';
    protected $title = null;

    public function initContent()
    {
        //add tabs content elements
    }
}