Problem with XFine2

I hope someone can help, I have added a modeline to XF86Config in order to handle a 1280x800 resolution. All other resolutions were removed. YaST2 reports the resolution correctly, but XFine2 is reporting 1024x768. KDE is also starting up in 1024x768. Is there some trick to getting XFine2 and KDE to use the correct resolution and not 1024x768? I'm using Suse 9 with updates. Many thanks for your time, -Scott