<div apply="pkg$.TestComposer"> 

    <grid id="inboxGrid" height="350px" 

        rowRenderer="pkg$.MyRowRenderer"

        emptyMessage="Nothing in Inbox.">        

        <columns>

            <column  label="Subject" />

            <column width="150px" label="Received" />

            <column width="80px" label="Size" />

        </columns>

    </grid>

    <button label="updated data and refresh" id="refreshBtn" />

  </div>

</zk>