[totaltec]

Here is my functioning code:

<?php

namespace XLite\Module\Guru\GoUnmanned\Controller\Customer;

abstract class ACustomer extends \XLite\Controller\Customer\ACustomer implements \XLite\Base\IDecorator
{
	public function isCheckoutLayout()
	{
		return true;
	}
}

The file is saved as: XLite/Module/Guru/GoUnmanned/Controller/Customer/ACustomer.php

I hope it helps.