I have added the mentioned library but still cannot find those editors available for select in model designer. please advice.
Hello Vicki Tse, I’m sorry for the delayed answer.
ASPxXafariTreeListEditor displays data similarly to DevExpress ASPxTreeListEditor These List Editors are targeted for objects that implement the ITreeNode interface from the Business Class Library (see TreeList Editors Module Overview on DevExpress)
Regards, Pavel On behalf of Xafari Client Services Team