Using Ubuntu 12.10 under VirtualBox and cannot remove black panels in the VirtualBox window

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http://askubuntu.com – I have got my Ubuntu pretty much running almost the way I want. My only problems is. My resolution is only capped at 1024x768. I changed it to 1280x960 and my entire screen is out of focus and just wrong. I can handle up to 1366x768 on my screen, but that option is not available and can't seem to find it in google. So, something things I need help fixing. How can I get Ubuntu resolution to 1366x768, if possible, or at least to 1280x960 with out my screen going out of focus for reasons I don't know why. I have already got VirtualboxgGuestAdditions.iso and working properly. Finally, when (HowTos)