title: Onclick on row grid with ZK over Grails
body: <p>I have a grid and its rows are programatically inserted by the composer. I would like to know which row is clicked.</p>
  
  <p>The zul file.</p>
  
  <pre><code>&lt;grid mold="paging" hflex="1" pageSize="10" id="gridBook"&gt;
      &lt;columns&gt;
          &lt;column align="center"&gt;id&lt;/column&gt;
          &lt;column align="center"&gt;Title&lt;/column&gt;
          &lt;column align="center"&gt;Author&lt;/column&gt;
      &lt;/columns&gt;
  &lt;/grid&gt;
  </code></pre>
  
  <p>The composer</p>
  
  <pre><code>gridBook.append{
      rows{
          list.each{ e-&gt;
              row{
                  label(value:e.id)
                  label(value:e.title)
                  label(value:e.author)
              }
          }                
      }
  }
  </code></pre>