A charismatic, yet slightly geeky heartthrob of teen-pleasing films of the late 1980s, Patrick Dempsey succeeded in doing what few teen idols ever manage to do – disappear off the radar for several years before resurrecting their adult career as the resident hunk on one of the most popular TV shows of its time. Almost 20 years after riding that famous lawnmower to fame as the wannabe lady killer Ronald Miller in “Can’t Buy Me Love” (1987), Dempsey landed the part of the stylishly coiffed neurosurgeon Dr. Derek Shepherd on the monster hit, “Grey’s Anatomy” (ABC, 2005- ). Hitting a career high