BMenuScroller
class BMenuScroller;
BMenuScroller* fUpperScroller;
BMenuScroller* fLowerScroller;
BMenuScroller::SetEnabled(bool enabled)
BMenuScroller(frame)
BMenuScroller(frame)
BMenuScroller(BRect frame);
class UpperScroller : public BMenuScroller {
class LowerScroller : public BMenuScroller {
BMenuScroller::BMenuScroller(BRect frame)
BMenuScroller::IsEnabled() const