The simple "button" seems to be missing from the Controls in the Carbide UI designer. I'm referring to the setting item that navigates to a next setting item list, similar to the ones found when editing a SIP profile at the bottom of the list, "Proxyserver" and "Registrarserver".

I'm sure there is a button control that can be added manually, but it will cause a mixup of managed (designed) and manually created controls, reducing maintainability.