When a user interface of a parent software application is modified such that user interface components of an add-in application are not compatible with the parent application user interface, user interface components associated with functionalities of the add-in application are added to the modified parent application user interface. A prior user interface of the parent application to which the add-in application user interface components are added is run in a background of the parent application and is not visible to users. User interface components in the parent application user interface are linked to corresponding add-in application user interface components in the prior user interface. Selection of a user interface component from the present user interface that is associated with an add-in application functionality causes selection of a corresponding user interface component in the background user interface, and the associated add-in functionality is executed.