What's the difference between PopUpButton, PopUpMenuButton and ComboBox controls in Flex?

Question

I find PopUpButton, PopUpMenuButton and ComboBox controls have the same function and behavior in Flex. What's the difference between them? Are they redundant?

Thanks

Answer 1

combobox and popupbutton extends different classes so they inherit different properties and methods. popupmenubutton extends popupbutton and has some new properties: dataDescriptor, dataProvider, iconField, iconFunction and others (see AS3 docs)