Windows 7: Windows Live mail spelling check current language

In Live Mail I work with up to 3 different languages.
I understand that the spelling check detects which laguage is used and automatically starts checking accordingly.
Some image of the spelling check menu I have seen on the net did show a "current laguage" button in the spelling check menu.
However in the menu on my computer ( Dutch version) this button is not there.
I appreciate suggestions

I have a box (in WLM 2009) that can be checked called "check spelling in current input language". Is that the one? I'm not sure what it does since my spelling is checked even if that box is unchecked but maybe it refers to the case where multiple languages are installed.

Here's a video about spell check settings in WLM, not sure if it's what your looking for. But, take a look.

How to spell check in Windows Live Mail 2011 - YouTube

Indeed Rocerr that is the one. But like I mentioned that box is not there in my Windows 7 Live Mail

That's strange since the video posted by Sub Zero55 is supposed to be for the current version (2011) and the Options/Spelling tab looks like this: