Heh...
If you can have both wants and needs panels open in game, that means you are playing the game at least at 1280*1024. If you put it in the window, and size said window so it fills the desktop, and you can only have one panel open, that tells me your desktop is set to a resolution of 1024*768. Just an observation based on what you said in your post. If your monitor is 19", then 1280 on the desktop is what is recommended. If it is 17" I can see why you have it at 1024, but it would run 1280.