Flex 4 Tlf Problem! How to get active Paragraph?!

I have following TLF XML:
private var text:XML =
<flow:TextFlow fontSize="20" paddingRight="50" paddingBottom="50" paddingTop="50" paddingLeft="50" whiteSpaceCollapse="preserve" xmlns:flow="http://ns.adobe.com/textLayout/2008">
 <flow:p>
 <flow:span>Hallo liebers Programmili... du tust schon langsam meinem koepchen weh</flow:span>
 </flow:p>
</flow:TextFlow>;
I try to get the Paragraph for a selection inside the text using following Methodes:
var index:int = tf.interactionManager.anchorPosition; // i get 29 here
var child:FlowElement = tf.getChildAtIndex(index); // undefined - it should be the flowElement containing the text... <flow:span></flow:span>
var para:ParagraphElement = test.getParagraph();//undefined - it should be the paragraph
I really started to enjoy the new framework... but now i am getting really mad
Can anybody imagine what i am doing wrong? The undefined itself makes me suspicious... shouldn't it be null?
Help would be much appriciated!

I just saw i posted this into the wrong thread... reopend the topic at
http://forums.adobe.com/thread/568455
Thx so far!

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