public ColumnBuilder<
            T_ROW,
            T_CELL_VAL,
            T_CELL> withStyleName(final String styleName) {
        if (styleNames == null) {
            styleNames = new ArrayList<>();
        }
        styleNames.add(Objects.requireNonNull(styleName));
        return this;
    }
Add a style that will be applied to all rows in this column
stroom-core-client-widget/src/main/java/stroom/data/grid/client/ColumnBuilder.java