[SOLVED] Anyone able to help me with a xrandr prompt?

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http://ubuntuforums.org – In Ubuntu i have no problems setting up my dual monitor set up using - xrandr --output DVI-I-1 --left-of DVI-I-2 I then go into display and change the resolution of one of the monitors. Using LXDE i can't seem to change the resolution using the display settings tool. It simply won't apply the changed settings for some reason so i'm wondering, can i include the screen resolutions into the xrandr prompt? My left screen is 1280x1024 and the right one is 1440x900. Anyone able to help me to do that? (Hardware)