The Dallas Morning News has portrayed him relentlessly as a greedy, high-living, double-dealing fraudster. (Right after conceding he did lots of admirable work.) But for some reason a number of Dallasites haven’t bought into The News’ characterization of former UT Southwestern Medical Center president Dr. Kern Wildenthal. Among them, it seems: Children’s Medical Center. The country’s fifth-largest pediatric hospital has just appointed Wildenthal president of its foundation and executive vice president of Children’s Medical Center.