// responsible for refreshing the control
virtual void SetShaftPartState(wxScrollThumb::Shaft shaftPart,
int flag,
// responsible for refreshing the control
virtual void SetShaftPartState(wxScrollThumb::Shaft shaftPart,
int flag,
virtual void OnPageScrollStart() = 0;
// called while the user keeps the mouse pressed above/below the thumb,
virtual void OnPageScrollStart() = 0;
// called while the user keeps the mouse pressed above/below the thumb,