public static <T_ROW> ColumnBuilder<T_ROW, Boolean, Cell<Boolean>> redGreenTextColumnBuilder(
            final Function<T_ROW, Boolean> valueExtractor,
            final String greenText,
            final String redText) {
        return new ColumnBuilder<T_ROW, Boolean, Cell<Boolean>>(
                valueExtractor,
                () -> new RedGreenTextCell(greenText, redText));
    }
A simple text cell with the value of the hover tooltip provided by tooltipFunction, which is
applied to the cell value.
stroom-core-client/src/main/java/stroom/util/client/DataGridUtil.java