thank's for your reply. Fiddeling around a little yesterday and out of a sudden it worked out. Not really sure whether i changed anything but now it works using a ITDB Screen and a ITDB Mega shield with following settings
//Change screen type and pins if required
UTFT myGLCD(ITDB32S, 38,39,40,41); // Remember to change the model parameter to suit your display module!
The first led drivers are connected and now i can start adding the rest of the hardware.
Thank's a lot for that code as i'm not that perfect in programming ;-)
is there a reason why you're using two pins for the onewire and not daisy chaining two sensors at one pin?