public ColumnBuilder<
            T_ROW,
            T_CELL_VAL,
            T_CELL> defaultSortAscending(final boolean defaultSortAscending) {
        isDefaultSortAscending = defaultSortAscending;
        return this;
    }
Add a class to the cell if it is not enabled, so enabled and disabled rows appear
differently.

@param enabledFunction A function to return true if the row is enabled.
stroom-core-client-widget/src/main/java/stroom/data/grid/client/ColumnBuilder.java