title: Cant add tt_news plugin into folder as "use as container"
body: <p>I installed tt_news 3.6.0 into typo3 6.2.15. 
  Extension installed successfully.</p>
  
  <p>But i created folder in page tree and i want to use "Use as Container" in Behaviour tab and i dont see this plugin on list.</p>
  
  <p>Any ideas what can be wrong ?</p>