Select an Entry or Add a New One ComboBox
From Qt Wiki
How to select a specific text entry (or add it if does not exist) in a combo box
The following method acts on a combo box searching for a specified text string and:
- if the string is present select it
- if the string is not present add it to the combo box model
In the following piece of code myText is the QString searched for and combo is a reference to the combo box.