如何实现完全自定义的可拖动控件？

I work on an application that requires some fancy custom controls. Inheriting from the .net Control class has caused various problems and is making things harder as time goes on. I won't get into the specifics here, but I am creating my own light weight control architecture to avoid some of these problems. Things art working nicely, but I need to add drag and drop functionality into my architecture. I work on an application that requires some fan