This was done in a ubuntu-netbook-remix build from Mar 23, 2009, oem-config version 1.54.9. The netbook I was using was an Asus Eee900
I was testing oem install with UNR, and after reaching the initial boot, I ran oem-config-prepare so that firstboot would launch on the next reboot. On the next reboot, oem-config-firstboot ran, but the window was sized way to big for the standard supported 1024x600 resolution of netbooks. Buttons at the bottom of the screen were not visible. Screenshots attached.