ASP.Net Custom/User Control for Drag-Drop-Reorder

I need this exactly, but in an ASP.Net 3.5 control. [login to view URL] Hide the javascript layer, and make it a pure control. Basically, I need the same functionality of the AjaxControlToolkit's ReorderList control, but that the items can also be moved to another ReorderList control. ## Deliverables Requirements * State of the item orders in containers should maintain across postbacks. * Should be able to work inside UpdatePanel * Written in C# * Should be able to be add/delete items to a container in code-behind * Should have an event when an item is dropped on a container that provides the IDs of the item that got dropped, which container it was dropped to, and which container it was dragged from