ComboBox Completer Index Problem

[majatu]

When i choose something in completer, combobox index does not change. It's changing only when i press enter key. But i want to change index of combo in completer by choosing mouse from popup. How i can do it? Help

QComboBox *cb=new QComboBox();
                cb->setModel(this->productModel);
                cb->setModelColumn(1);
                cb->setEditable(true);
                cb->setAutoCompletion(true);
                cb->setAutoCompletionCaseSensitivity(Qt::CaseInsensitive);

QComboBox *cb=new QComboBox();
                cb->setModel(this->productModel);
                cb->setModelColumn(1);
                cb->setEditable(true);
                cb->setAutoCompletion(true);
                cb->setAutoCompletionCaseSensitivity(Qt::CaseInsensitive);

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