title: How to set td or cell's trigger unable? I can fire the trigger but do not turn off the trriger
body: <p>How to set td or cell's trigger unable? I can fire the trigger but do not  turn off the trriger.I set the trigger like this:</p>
  
  <pre><code> my.contextMenu({
          trigger: '#Grid  td ',
          //leftButton: false,          
          rightButton: true,
          menu: '#testMenu',
          callback: ctxCallback
      });
  </code></pre>