class EV_SCROLLABLE_AREA_IMP Ancestors EV_SCROLLABLE_AREA_I* EV_VIEWPORT_IMP WEL_RGN_CONSTANTS Clients EV_SCROLLABLE_AREA EV_SCROLLABLE_AREA_IMP Suppliers BOOLEAN EV_SCROLLABLE_AREA_IMP EV_VIEWPORT_IMP EV_WIDGET_IMP* INTEGER_32 WEL_SCROLLER