Hi guys,
I managed to make it work... I am actually writing this post "through" the pineapple :-)
Thank you all for your feedback. Danke Dir vielmals Seb... I wish I had that kind of support from our partners at work :-) You are amazing. Thesugarat, saving before committing helped :-) Thankx for the hint.
The disconnect function works well now.
There still seems to be a bug however : The passphrase of my AP contains the character & and it seems this is a problem. I wasn't able to connect to my AP through the network tile at all and had to connect through the wifi manager infusion. When I entered my wifi passphrase through the wifi manager infusion, the passphrase was trunked in /etc/config/wireless. Everything coming after the & character, & included, was missing. I had to edit the /etc/config/wireless file manually to make it work. I suppose that this & character might also cause some problem when trying to connect the network tile.
Thankx again
Cheers all