[Haskell-cafe] How do I sort items in a wxhaskell listCtrl?

Hi list, I couldn't find any clues googling and turn to you in the hope that someone might point me in the right direction: I found the function |listCtrlSortItems2| with type |ListCtrl a -> Closure b -> IO Bool| and |closureCreate| (which type is a bit involved..), but I have no idea how to use them.. In the end, I would like to have a listCtrl where clicking on column headers will sort the items and maybe even indicating sorting order with a little arrow. Any help is really appreciated, Tilmann