class EV_HORIZONTAL_BOX_IMP Ancestors EV_BOX_IMP* EV_HORIZONTAL_BOX_I* Clients EV_HORIZONTAL_BOX EV_HORIZONTAL_BOX_IMP Suppliers ARRAYED_LIST [G] BOOLEAN EV_BOX_IMP* EV_HORIZONTAL_BOX_IMP EV_WIDGET_IMP* INTEGER_32