Typed racket GUI: pasteboard method set-area-selectable not working

Question

I using the typed/racket/gui package to build an application. I need to turn off the selection box of the pasteboard% that is activated by default. Usually you would do this using the method set-area-selectable but somehow it is not working for me as I am getting this error:

  Type Checker: send: method not understood by object
  method name: set-area-selectable
  object type: (Instance Pasteboard%)
  in: (send this set-area-selectable #f)
  location...:

Here is my code:

(define-type Graph-Pasteboard%
    (Class #:implements/inits Pasteboard%)
)
(: graph-pasteboard% : Graph-Pasteboard%)
(define graph-pasteboard%
    (class pasteboard%
    (super-new)
    (: do-paste (Integer -> Void))
    (define/override (do-paste time) (void))

    (send this set-area-selectable #f)
    ))

I have checked the version of that package I have installed and it should support this functionality.

One solution to this would be to override the method on-default-event but this would mean a lot of unnecessary work.