The tree view is customisable to fit most applications. It isn't merely an implementation. It defines a framework for drag and drop trees as well. The developer implements the items for the tree view or uses the existing.
Items can have individual behaviour for click and drop actions.
Advantages - Useful for most applications. Download Download the fully functional source or the fully functional binary package. Notice that the demo is just one example of what you can do with the tree view. With a binary license you can customize the tree view for you application. Another example of the tree view is Bookmarks Online .