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When you create a new content element by using the record wizard, you'll get a tab-based list of possible content elements to choose from. In the old days, those were PHP classes known as "wizicons" and automatically created by the kickstarter extension. You may guessed it already, it's about $GLOBALS['TBE_MODULES_EXT']['xMOD_db_new_content_el']['addElClasses'].
Migrating an old extension can be a tough job, especially when the extension was developed before TYPO3 CMS 6.2 times and thus doesn't follow the current best practises. In this article I'll show you how to migrate the TCA placed in an ext_tables.php file of a real extension that was originally developed for TYPO3 4.5.