virtual int GetArrowState(wxScrollArrows::Arrow arrow) const;
virtual void SetArrowFlag(wxScrollArrows::Arrow arrow, int flag, bool set);
virtual bool OnArrow(wxScrollArrows::Arrow arrow);
virtual int GetArrowState(wxScrollArrows::Arrow arrow) const;
virtual void SetArrowFlag(wxScrollArrows::Arrow arrow, int flag, bool set);
virtual bool OnArrow(wxScrollArrows::Arrow arrow);