void MainWindow::registerSearchBar( KLineEdit * bar ) {
    if ( !bar )
        return;
    d->searchBar = bar;
    bar->setFixedHeight( 0 );
    connect( bar,  SIGNAL(textChanged(QString)),//SIGNAL(stringFilterChanged(QString)),
             this, SLOT(slotSearchBarTextChanged(QString)) );
    d->tryToConnectSearchBarToKeyTreeView();
}

void MainWindow::Private::slotSearchBarTextChanged( const QString & text ) {
    if ( text.isEmpty() && searchBar && searchBar->isVisible() ) {
        searchBar->setFixedHeight( 0 );
        searchBar->hide();
    } else if ( !text.isEmpty() && searchBar && !searchBar->isVisible() ) {
        kDebug() << "searchBar->minimumSizeHint()" << searchBar->minimumSizeHint();
        searchBar->setFixedHeight( searchBar->minimumSizeHint().height() );
        searchBar->show();
        searchBar->setFocus();
    }
}