Yes the notebook part IS a plugin, and no, I didn't provide a constructor. I thought a default constructor might be provided by Qt... I just implemented the extra functions I need for the comboBox.

The .h file is in this post, this is the cpp file:

Qt Code: 
  1. void AreacodesCombobox::initializeFields()
  2. {
  3.    QString blank = " ";
  4.    setSelectedAreacode(blank);
  5.    setSelectedLocale(blank);
  6.    clear();
  7. }
  8.  
  9. void AreacodesCombobox::on_returnPressed()
  10. {
  11.    QString aLocale=currentText();
  12.    if ((aLocale.trimmed().length() > 1) && (aLocale != QString(selectedLocale()).toUpper()))
  13.    {
  14.       QString searchText= ("UCASE(locale) like '%");
  15.       searchText.append(aLocale.trimmed().toUpper());
  16.       searchText.append("%' order by LOCALE");
  17.       QString clause = searchWordsClause(aLocale, "locale", "AND", false,"locale");
  18.       clause.prepend("SELECT  Areacode, Locale FROM AreacodesView WHERE ");
  19.       clause.append(" Order by Locale");
  20.       QSqlQuery query(clause);
  21.       if (query.isActive())  // successful execution
  22.       {
  23.          if (query.size()==0)
  24.          {
  25.             QApplication::beep ();
  26.             QMessageBox::warning(this, tr("Postcode Search"),
  27.                tr("No match found.\nCheck the spelling and try again."), QMessageBox::Ok);
  28.             setFocus();
  29.          }
  30.          else
  31.          {
  32.             clear();
  33.             while (query.next()) 
  34.             {
  35.                QString locale = query.value(0).toString();
  36.                addItem(locale);
  37.             }
  38.             if (query.size()==1)
  39.                QComboBox::setCurrentIndex(1);
  40.             else
  41.             {
  42. //               comboBox()->select(1, true);
  43.                QComboBox::showPopup();
  44.             }
  45.          }
  46.       }
  47.       else 
  48.       {
  49.          QApplication::beep ();
  50.          QMessageBox::warning(this, tr("SQL Error"),
  51.             query.lastError().text(), QMessageBox::Ok);
  52.       }
  53. //     else if (model->query().isSelect()) // is a select statement
  54.    }
  55. }
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