I'm currently evaluating the RadListView in detail view and am getting a nullreference at runtime if I set the width of a column to anything other than the default 200 width. For instance if I go into the designer code and comment the offending line: "listViewDetailColumn1.Width = 100F;" then it works fine with no runtime errors. With that line in the code I get the nullreference error. This is using VS2010 and .Net 4.0.