In the past I created small extension to extend the tt_news possibility. By kickstarter I have created two new fields to tt_news table. Everything worked fine - on every tt_news record I have two flexform fields in "extended" tab.
After upgrade to TYPO3 6.2 these field disappeared. Is there any chance to turn them on?
In the typo3conf/PackageStates.php file make sure that yourextname mentioned by Vishal is placed under the tt_news (just be sure that your ext is loaded after tt_news) otherwise the last one will cover your changes.