UI: Using the UI with Delphi

I've been testing the UI SDK with Delphi and it seems that a lot of functionality is lost when the UI type library is imported into Delphi. Many of the object/interface properties become read-only, hence some of the objects/interfaces lose a tremendous amount of their usefulness. For example, the ComboBox.ValidValues property is read-only in Delphi, hence making the ComboBox almost unusable. Actually nearly all objects/interfaces which has a ValidValues property has this property set to read-only

Has anyone else using Delphi come across the same problem when using the UI SDK? I've used the DI SDK quite happily in Delphi, but UI SDK is proving to be quite a different story.