[Typo3] <itemsProcFunc> in flexform?

[Rupert Germann]

joachim rinck wrote:
> I've been searching for hours now but I don't find anything that makes
> my itemsProcFunc work in flexform. It is working in ext_tables.php but I
> really want the value to be stored in flex. Also i recently read that
> adding fields to tt_content for some extension is highly discouraged.
> 
> Could someone please help me, point me to working documentation or send
> me a working example? Here is my flexform and the itemsprocfunc code:

take a look how it is done in tt_news.
I use this in there for adding new "render codes" from extensions.

greets
rupert