Updating CellTable row style

Hi,

I am trying to update a row style for on mouse hover.

mappings.addCellPreviewHandler(new Handler<MappingInstructionVO>() {

      @Override
      public void onCellPreview(CellPreviewEvent<MappingInstructionVO> event) {
        if (BrowserEvents.MOUSEOVER.equals(event.getNativeEvent().getType())) {
           mappings.getRowElement(event.getValue().getExecutionOrder()).getStyle().setBorderColor("Red");
      }
});

Any idea why 

mappings.getRowElement(event.getValue().getExecutionOrder()).getStyle().setBorderColor("Red");

has no effect?

Thanks

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