A program actions mechanism enables to add new functionality to the modeling tool and the way to invoke it through GUI. In this case, all menu commands and buttons are considered as actions. Related pages Invoking actionsCreating new actionsActions' hierarchyWorking with iconsMDP protocolRunning action with progress Using and extending other UI componentConfiguring element Specification windowShowing Element seletion dialogShowing question, error, warning dialogsShowing notifications, adding text into Message WindowCreating PopupMenu or other menuAdding custom project window