[TYPO3-mvc] How to replace deprecated method FlashMessageContainer->add()

[Dirk Wenzel]

The method FlashMessageContainer->add() is deprecated since TYPO3 
version 6.1.

Would you use
$this->controllerContext->getFlashMessageQueue()->addMessage(new 
\TYPO3\CMS\Core\Messaging\FlashMessage('<message text>', '<message 
header', \TYPO3\CMS\Core\Messaging\FlashMessage::<message type constant>));
instead?

A comment in the FlashMessageQueue class states that the method 
addMessage() is not yet visible and will be made public in version 6.3.

Cheers
Dirk