[HOpenGL] wxHaskell

Hi there, this isn't probably the right place but my question is more opengl specific, so I decided to send a mail to this list. Is anyone in here who has done any opengl thing with wxhaskell? My problem is, that the sample in the wxhaskell code under /samples/contrib/GLCanvas.hs doesn't show anything except of a white screen. But there aren't any error messages and I don't know if this is a problem of the samplecode or a problem of mine. I use ghc 6.2.1 and the wxhaskell from the cvs, but I think that doesn't matter because the stable version shows the same effect. It would be a great help if anyone has a small working sample and can send me this. Cheers Patrick