title: grid colspan does not work for IE in GWT
body: <p>I was created the grid in GWT
  and set the attribute colspan for one row...</p>
  
  <pre><code>gridSample.setWidget(0, 0, new HTML("Can you improve this checklist?  Please rank and submit your comments below"));
  
  gridSample.getCellFormatter().getElement(0, 0).setAttribute("colspan", "4");
  </code></pre>
  
  <p>The colspan does not work for IE...</p>