[TYPO3-english] Category tree in extension

[Dawid Pacholczyk]

Hello,
 how can I create a category tree in my onw extension ?

For example I want to make an extension that allow users to add "thing" and
"category". Category can be added to "thing" (more than one category).

How can I achive that ?

Best regards,
Dawid "Fixus" Pacholczyk

-- 
Dawid Pacholczyk
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http://typo3blog.pl (only polish version at the moment)