更新w/ EF4 repo & MVC2的问题无法更新多对多图形。

I can't seem to successfully update a many-to-many graph in MVC2 using EF4. I figured the simplest thing to do would be to Clear() the entire graph, call SaveChanges(), then rebuild the graph calling SaveChanges() again at the end, but it's not working. All my other properties I can't seem to successfully update a many-to-m