Updating Atlas

After updating the AtlasControlToolkit to the latest version 1.0.60914.0, i ran into a bunch of problems. The first was the removal of the third AtlasControlExtenderer binary, whichwas easy to fix, just had to update references to the AtlasControlToolkit and namespaces.
The other issue i had was i was gettting a debugger alert client side about
PageRequestManagerID not being an attribute on draggablelistitem. This is a custom drag item i have implemented, so i just went digging through AtlasControlToolkit and found something similar to what i wanted to do DragPanelProperties and it has go this code:

        [EditorBrowsable(EditorBrowsableState.Never), 

  Browsable(false), 

  DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]

        public string PageRequestManagerID {

            get { return null; }

            set { throw new NotImplementedException(); }

        }

So i just copied that into mine, and things worked. Its weird that there is no need to have the "new" keyword on this method. And why didnt it work in the first place.