public TableRowElement getRowElement(int row) {
        flush();
        return getChildElement(row);
    }
Get the {@link TableRowElement} for the specified row. If the row element
has not been created, null is returned.

@param row the row index
@return the row element, or null if it doesn't exists
@throws IndexOutOfBoundsException if the row index is outside of the
                                  current page
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractCellTable.java