public ColumnSortList getColumnSortList() {
        return sortList;
    }
Get the {@link ColumnSortList} that specifies which columns are sorted.
Modifications to the {@link ColumnSortList} will be reflected in the table
header.

<p>
Note that the implementation may redraw the headers on every modification
to the {@link ColumnSortList}.
</p>

@return the {@link ColumnSortList}
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractCellTable.java