Thanks for your reply.

Offtopic:
I am working now on the lamp tutorial, which is great. But how can i set the blueprints for the lamp effectivly. Cause some parts are bigger than others and just placing the references in the top, right and side viewport is not enough. I already watched the blueprint setup tutorial, but in case of the lamp i guess it does not help me very much, as there are now allegations of the size.

Edit: Is there any option so that i can turn the mesh slighlty transparent, rather the hide the whole thing? I read about the moi.ini. Other ways?