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    Qt 6.10: QComboBox with groups: Select items

    General and Desktop c++ qt 6.10.1 qcombobox qtreeview
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    T
    Because I found the solution in the meantime I reply to my own post. The following code sets the selection as expected: void TElementBorderName::setBorder(const QString& border) { mBorder = border; const QModelIndexList matches = mModel->match(mModel->index(0, 0), Qt::DisplayRole, border, 1, Qt::MatchExactly | Qt::MatchRecursive); if (!matches.isEmpty()) { const QModelIndex modelIdx = matches.first(); // Temporarily set the root to the parent to allow row-based selection mCombo->setRootModelIndex(modelIdx.parent()); mCombo->setCurrentIndex(modelIdx.row()); // Restore the original root to show the full tree mCombo->setRootModelIndex(QModelIndex()); } } A.T.