[TYPO3-dev] strange problem with $this->conf

[Stefan Busemann]

Hi,

i got a strange Problem. For my extension i use this typoscript:

filelist {
	# typolink : formurl action
	form_url.parameter.data = TSFE:id
	form_url.addQueryString = 1
	# stdWrap : how many items should be default in the filelist
	defaultLength = 10
	useAlternatingRows = 1
	... bla bla ...
}

When i use 
t3lib_div::debug($this->conf['filelist.']['useAlternatingRows']);

i receive a Null value.

But if use t3lib_div::debug($this->conf); then i get the right value:

filelist.
	form_url.	
		parameter.	
			data	TSFE:id
		addQueryString	1
	defaultLength	10
	useAlternatingRows	1

So what can be the problem? I'm confused.

Stefan