THANK YOU, but I found it.....
http://techboard.nemetschek.net/ubbthreads/ubbthreads.php?ubb=showflat&Board=7&Number=63231&Searchpage=4&Main=14607&Words=wheel+pan&topic=0&Search=true#Post63233
Thank you for all the responses.
I have 12.5 on a Mac.
12.5 on the website says that it is possible to use hte scroll wheel to pan the drawing.
I cannot find how to work this.
I have to still hold the space bar and single click to pan.
Does the mouse wheel really pant he drawing like they say?
Any ideas how?
Thank you.