<layers>
<visual>

<param name="translation_y" type="anim">
<duration>0.4</duration>
<style>linear</style>
      <keyframe at="0">0</keyframe>
      <keyframe at="1">1</keyframe>
<start ref="visual.top">1</start>
<end ref="screen.bottom">1</end>
</param>

</visual>
</layers>