Hi Daniel If you use a binding between a value of you model and the selectedIndex of your combobox, the control updates automatically whenever you change the model property.
//in MyModel
[Bindable] public var selectedIndex : int
//in MyForm
<mx:ComboBox selectedIndex="{ myModel.selectedIndex }" .../>
Now whenever you change myModel.selectedIndex, the combobox will
update automatically.
You can find some more examples of binding in the docs.
Cheers
Ralf.
