diff --git a/keduvocdocument/keduvocvocabularyfilter.cpp b/keduvocdocument/keduvocvocabularyfilter.cpp
index 17450da..0ea7c33 100644
--- a/keduvocdocument/keduvocvocabularyfilter.cpp
+++ b/keduvocdocument/keduvocvocabularyfilter.cpp
@@ -1,99 +1,96 @@
 /***************************************************************************
 
     Copyright 2007-2008 Frederik Gladhorn <frederik.gladhorn@kdemail.net>
 
  ***************************************************************************/
 
 /***************************************************************************
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
  *   the Free Software Foundation; either version 2 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  ***************************************************************************/
 
 #include "keduvocvocabularyfilter.h"
 #include <keduvocvocabularymodel.h>
 
 class KEduVocVocabularyFilter::Private
 {
 public:
     Private();
-    virtual void setSourceModel(QAbstractItemModel *model) {
-        Q_UNUSED(model)
-    }
 
     KEduVocVocabularyModel * m_model;
     QString m_filterString;
 };
 
 KEduVocVocabularyFilter::Private::Private() {
     m_model = 0;
     m_filterString = "";
 }
 
 KEduVocVocabularyFilter::KEduVocVocabularyFilter(QObject *parent)
     : QSortFilterProxyModel(parent),
       d( new Private )
 {
     // do not use capitalization for searches
     setSortCaseSensitivity(Qt::CaseInsensitive);
     setFilterCaseSensitivity(Qt::CaseInsensitive);
     // sort locale aware: at least puts umlauts and accents in the right position.
     // Not sure about languages that are more different.
     // Also depends on the current locale.
     setSortLocaleAware(true);
 
     // eventually accept only one language if so desired...
     setFilterKeyColumn(-1);
 }
 
 KEduVocVocabularyFilter::~KEduVocVocabularyFilter()
 {
     delete d;
 }
 
 QModelIndex KEduVocVocabularyFilter::appendEntry(KEduVocExpression *expression)
 {
     if (!d->m_model) {
         return QModelIndex();
     }
     return mapFromSource(d->m_model->appendEntry(expression));
 }
 
 void KEduVocVocabularyFilter::setSourceModel(KEduVocVocabularyModel * model)
 {
-    d->setSourceModel(model);
+    QSortFilterProxyModel::setSourceModel(model);
     d->m_model = model;
 }
 
 void KEduVocVocabularyFilter::setSearchString(const QString & expression)
 {
     d->m_filterString = expression;
     invalidateFilter();
 }
 
 bool KEduVocVocabularyFilter::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
 {
     if (d->m_filterString.isEmpty()) {
         return true;
     }
 
     int columns = d->m_model->columnCount(QModelIndex());
     for (int i = 0; i < columns; i += KEduVocVocabularyModel::EntryColumnsMAX) {
         QModelIndex index = sourceModel()->index(sourceRow, i, sourceParent);
         if (sourceModel()->data(index).toString().contains(d->m_filterString, Qt::CaseInsensitive)) {
             return true;
         }
     }
     return false;
 }
 
 KEduVocLesson * KEduVocVocabularyFilter::lesson()
 {
     if (d->m_model) {
         return d->m_model->lesson();
     }
     return 0;
 }