Wrong screen is main display (TwinView)

Hi,

I have a laptop to which I connected a second monitor. I use TwinView to
stretch my screen over both monitors and TwinView's Xinerama extension
to let applications maximize only on one monitor.

This works good far. But one problem remains:

The second monitor is the main screen. My login manager (KDM) and KDE's
panel are displayed on it. Of course I want my laptop's monitor to be
the main screen (screen 0) and the second monitor should be screen 1.

How do I achieve this goal?

This is the Device-Section of my xorg.conf:

,----[ /etc/X11/xorg.conf ]
| Section "Device"
| Identifier "GeForceTwinView"
| VendorName "nvidia"
| Driver "nvidia"
| Option "DPMS"
| BusID "PCI:1:0:0"
| Option "AllowGLXWithComposite" "true"
| Option "HWCursor" "on"
| Option "CursorShadow" "on"
| Option "CursorShadowAlpha" "32"
| Option "CursorShadowXOffset" "5"
| Option "CursorShadowYOffset" "5"
| Option "NvAGP" "1"
| Option "NoLogo" "on"
| Option "TwinView" "on"
| Option "SecondMonitorHorizSync" "31-82"
| Option "SecondMonitorVertRefresh" "55-120"
| Option "TwinViewOrientation" "RightOf"
| Option "MetaModes" "1400x1050, 1400x1050"
| EndSection
`----

Much thanks in advance,
Tassilo