public void setKeyboardSelectedRow(int row, int subrow, boolean stealFocus) {
        this.keyboardSelectedSubrow = subrow;
        super.setKeyboardSelectedRow(row, stealFocus);
    }
Set the keyboard selected row and subrow, optionally focus on the new row.

@param row        the row index relative to the page start
@param subrow     the row index of the child row
@param stealFocus true to focus on the new row
@see #setKeyboardSelectedRow(int)
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractCellTable.java