Because the buttons of the GUI must perform somewhat differently depending on the panel that is active in the tabbed pane, I want to refer not only to these panels but also to their members.

Properties pane: This pane shows the properties of the object that is open and active (in other words, a data model, or an entity inside a logical data model).

For instance, the Clear button should clear all the fields of the panel of the currently active tabbed pane, while the Add button should modify only the data associated with that panel.