In my metacity window theme for Ubuntu 12.04, I am trying to customise the close, minimize, and maximize buttons. I have the .png images in the folder already put on the window, but cannot move them closer to the top of the window. To explain this better, it seems Ubuntu Unity has a default setting to the location of the buttons, and they are set on their own position on the window bar when defined at coordinates (0,0). If I attempt to rise it upward in the theme's .xml file, by going into negative numbers as assumed through a coordinate system, then refresh it, it crashes. Clearly it cannot handle negative numbers. I have been searching forums and Google for a while and cannot find an answer. Does anyone know another way to accomplish this?