PDFLib writer thing

Hi, I'm running PHP4 on NT with IIS4 and it's fantastic, I've MySQL running on it, the full kit, feels just a Unix box! (well as close as windows will ever get to it anyway). I originally got the stock PDFLib, but couldn't get it working, this other dude sent me a PDFLib3.0 re-compiled for NT (which was pretty cool of him) and I've got it all fired up now, the only cow is I cant get the pdf_setrgbcolor_fill() thing working or the pdf_setgrey_fill() thing working, has anyone else had any success with this ?? Any other ideas how I could fill in an area or anything ?!? I just need a grey box on the form I'm making, and I'm kinda stuck. Kind Regards, Tim.