[TYPO3-mvc] Ajax request from backend and TYPO3_MODE

[Jan Kornblum]

Hello newsgroup,

i call a extbase controller action from both a backend module as well 
as from a frontend plugin. Inside the controller action i have to 
switch dependant on the TYPO3_MODE. But the TYPO3_MODE always seems to 
be "FE", even when the request was started from the backend. Perhaps 
because the request is done as ajax?

So how should i detect the proper TYPO3_MODE in this case?

Kind regardas, Jan