int guiWidth = (width - xSize) / 2;
int guiHeight = (height - ySize) / 2;
buttonList.clear();
buttonList.add(new GuiButton(0, guiWidth + 24, guiHeight + 32, 128, 20, MekanismUtils.localize("gui.itemstack")));
buttonList.add(new GuiButton(1, guiWidth + 24, guiHeight + 52, 128, 20, MekanismUtils.localize("gui.oredict")));
buttonList.add(new GuiButton(2, guiWidth + 24, guiHeight + 72, 128, 20, MekanismUtils.localize("gui.material")));
buttonList.add(new GuiButton(3, guiWidth + 24, guiHeight + 92, 128, 20, MekanismUtils.localize("gui.modID")));
}