lifecycle:on

<lifecycle:on
       event="{string}"
       hide="{boolean}"
       show="{boolean}">
</lifecycle:on>

<p>An event called foo will broadcast in 5 seconds.</p>
<lifecycle:delay delay="5000">
    <lifecycle:event event="foo">
        <search:alert style="alertbox-positive">Event foo has been broadcast</search:alert>
    </lifecycle:event>
</lifecycle:delay>
<lifecycle:on event="foo">
    <lifecycle:delay delay="1000">
        <search:alert style="alertbox-positive">Event foo has been heard so I have appeared!</search:alert>
    </lifecycle:delay>
</lifecycle:on>
<lifecycle:on event="foo" hide="true">
    <search:alert style="alertbox-warning">When I hear the event foo I will hide!</search:alert>
</lifecycle:on>