Mix Fixed and Relative Column Widths in CellTable?

I'm trying to have fixed width columns and relative width columns togheter, can't get it running.

As described here http://code.google.com/webtoolkit/doc/latest/DevGuideUiCellTable.html I am trying to do it in this way:

table.addColumn(checkBoxColumn);
table.addColumn(nameColumn, constants.Name());
table.addColumn(emailColumn, constants.Email());

table.setWidth("100%", true);
table.setColumnWidth(checkBoxColumn, 10.0, Unit.PX);
table.setColumnWidth(nameColumn, 40.0, Unit.PCT);
table.setColumnWidth(emailColumn, 50.0, Unit.PCT);

But I can't make it work. I am on Chrome / Mac. 

Is there anything that I am doing bad?

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