title: Specifying which Cell should receive focus next in a CellTable
body: <p>I'm using GWT 2.1.0</p>
  
  <p>I have a CellTable populated with Columns that use different Cells to edit different types of values (e.g. date, string, etc).  I want the user to be able to click in a cell, type a value, and hit enter to go directly to editing the next cell down, or tab to go directly to editing the next cell over.</p>
  
  <p>I've been looking through the Cell and CellTable interfaces but can't find anything that looks relevant.  How can I achieve this effect?</p>