To edit the ChoiceListproperty of a Radio buttons field or a Text Box use dialog boxChoice List in Designer. It is used to add, remove and edit elements.
If the field is linked to an Enumeration attribute or to an object with predefined elements, and you use the Fill button, missing elements are added to the choice list automatically (if there are no user-added elements, the system will add all available elements).
If there is nothing to chose from (e.g. a radio button field is linked to a Number attribute), the button is not displayed.
If all elements have already been added to the list, and you click the button, you will see a message informing you of that.