For users of Neoden TM245P I recommend this excellent white paper about centroids and rotation from Screaming Circuits:
www.screamingcircuits.com/assets/pdfs/understanding-the-centroid.pdf

Here is the Eagle *.ulp file that I modified for TM245P.  It's not perfect so be sure to test run your TM245P program. 
Getting part rotations right is the hardest part:
tm245a_mount.ulp