An improved user interface is provided for displaying selectable software functionality controls of a database application. When a task-based functionality tab is selected from the user interface, selectable functionality controls provided by the associated database application for performing aspects of a task related to the selected tab are presented in a ribbon-shaped user interface above a workspace in which a user is entering or editing data. Upon selection of a different task-based functionality tab, the presentation of functionality controls associated with the first task is removed, and selectable functionality controls associated with the second selected task-based functionality tab are presented in the user interface. The selectable functionality controls presented in the user interface are grouped into logical groupings for more efficient utilization. An extensibility model is provided for allowing users to develop and use customized user interfaces and to allow utilization of legacy user interfaces.