title: A GWT CellTable with frozen header and initial column
body: <p>I need to freeze the first column and first row of data in a CellTable, so that users can scroll through the data but still see the labels on the "axes."  The first column should scroll when the user scrolls up and down, and the header row should scroll when the user scrolls left and right.  Think "Freeze Panes" in Excel.</p>
  
  <p>I'm using GWT 2.1 and am willing to write my own widget to do this if no solutions already exist.  My question is a two-parter:</p>
  
  <ol>
  <li>Do any widgets already have this behavior?</li>
  <li>Any suggestions if I'm going to implement this myself?</li>
  </ol>
  
  <p>Thanks!</p>