@Override
            public T_CELL_VAL getValue(final T_ROW row) {
                return extractFormattedValue(row);
            }
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