class DV_SELECTION_WINDOW Ancestors DB_TABLES_ACCESS_USE* DV_MESSAGES* EV_TITLED_WINDOW Clients DV_SELECTION_WINDOW Suppliers BOOLEAN DB_TABLES_ACCESS* DB_TABLE_DESCRIPTION* DV_BUTTON DV_HORIZONTAL_BOX DV_SELECTION_WINDOW DV_TABLEROW_MULTILIST DV_VERTICAL_BOX EV_NOTIFY_ACTION_SEQUENCE EV_TITLED_WINDOW