<zk>
  <label>
   Click the button, should see text align at left.
  </label>
  <grid>
    <columns>
      <column label='column 1' />
      <column label='column 2' />
    </columns>
    <rows>
      <row align='center' id='row'>
        <label value='cell 2.1' />
        <label value='cell 2.2' />
      </row>
    </rows>
  </grid>
  <button label='set align left' onClick='row.setAlign("left")'/>
</zk>