title: GWT CellTable programmatically select CheckBoxCell
body: <p>I've got a cellTable with a CheckBoxCell column. What I'm trying to do is to have a set of buttons outside the celltable which let the user to automatically check/uncheck a different set of elements (for example check all / uncheck all, but I'd like to have more complex rules).</p>
  
  <p>What I don't understand is how to access the element (I suppose via row/col values ???) and get/set the value.</p>
  
  <p>Can anyone help me to figure out how to resolve it?</p>