See my implementation:
http://pastie.org/2003461
http://pastie.org/2003467

The call to add the column:

        // Remove Bet Column
        ClickableImageResourceCell removeCell = new 
ClickableImageResourceCell();
        Column<YourObject, YourObject> removeColumn = new Column<YourObject
, YourObject>(removeCell) {
            @Override
            public YourObject getValue(YourObject obj) {
                return obj;
            }
        };
        removeCell.setUpdater(this);


I use a ValueUpdater instead of a FieldUpdater. The class containing the 
CellTable implements ValueUpdater<YourObject>, I guess you can do the same 
with FieldUpdater.

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