Not really. I created the QComboBox in Designer. I checked the properties, there is nothing related to how the combo box is updated. Other than that, I just take the reference from ui and connect the combo to something:

Qt Code: 
  1. connect(ui.portComboBox, SIGNAL(currentIndexChanged(const QString)), &robotInterface, SLOT(setPortName(const QString)));
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That's how I see that the selection was successfully made.