[TYPO3-mvc] How to use jQuery in BE Module?

[Stig Nørgaard Færch]

> I've read something about using:
> $this->response->addAdditionalHeaderData()
> but haven't found out exactly how/where.

tried to add this to my controller:

     /**
      * @param Tx_Extbase_MVC_View_ViewInterface $view
      * @return void
      */
     public function initializeView(Tx_Extbase_MVC_View_ViewInterface 
$view) {
         $this->response->addAdditionalHeaderData('<style 
type="text/css">body {background-color: #000000!important;}</style>');
     }

Doesn't give any errors. But doesn't give me any black background either.

/Stig