awtk/demos/res/raw/ui/fade.xml

<dialog name="dialog" anim_hint="fade" x="c" y="m" w="80%" h="160">
  <dialog_title x="0" y="0" w="100%" h="30" text="Hello AWTK" />
  <dialog_client x="0" y="bottom" w="100%" h="-30">
    <label name="" x="center" y="middle:-20" w="200" h="30" text="Are you ready?"/>
    <button name="quit" x="10" y="bottom:10" w="40%" h="30" text="Yes"/>
    <button name="quit" x="right:10" y="bottom:10" w="40%" h="30" text="No"/>
  </dialog_client>
</dialog>