Adding and removing the column is - IMO - a bad idea. As far as I understood there'll be an easier way to add styles to columns in GWT2.5. However at the moment I've implemented a workaround that works for me - with some limitations: http://code.google.com/p/google-web-toolkit/issues/detail?id=6547#c4 . Basically you add two methods to the CellTable-class (you cannot extend the CellTable and add the methods in a new class, because the attributes thead, tfoot and tbody are not available outside the class) and have to make sure that after a range-change or any other redraw you reapply the column-styles again.
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