Error with xorg.conf when trying to add virtual screen to fix the problem of too small screen resolution for an application on 10.1" screen

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http://askubuntu.com – I am using a netbook with a 10.1 inch screen and resolution 1024x600. I am running Ubuntu 10.04 LTS and when using the neural network toolbox from Matlab a window is off the screen and I cannot access the buttons. I found this answer on SuperUser link, which describes two approaches. First to press alt while moving the window off the screen upwards so that the bottom part is visible and accessible. The next option is to add to the xorg.conf file Virtual 1024x800 There was no such file in /etc/X11/ so I created it and there were problems at reboot so the default was used. Is there a solution (HowTos)