<button w="50" h="50" >
  <image name="default" x="0" y="0" filename="data/gui/buttons/power_plus_d.png" visible="1" />
  <image name="active" x="0" y="0" filename="data/gui/buttons/power_plus_a.png" visible="0" />
  <image name="pressed" x="0" y="0" filename="data/gui/buttons/power_plus_a.png" visible="0" />
  <!--image name="disabled" x="0" y="0" filename="data/gui/buttons/up_dis.png" visible="0" /-->
</button>