[plt-scheme] list-box's maximum size of string?

Hello ,

 When i use following code:

   (send msg-lst set lines)

 where msg-lst is a instance of list-box%  and lines is a (listof strings)
 it complains with following error/message :

 "set in list-box%: expected argument of type <list of strings (up to
200 characters)>; ...  .."

 Some of my lines are indeed more than 200 characters long.

 So how do i overcome this restriction also , out of curiosity why such
 restriction is needed?

 Thanks