_ButtonRectFor
BRect _ButtonRectFor(int32 button) const;
Invalidate(_ButtonRectFor(ARROW1));
Invalidate(_ButtonRectFor(ARROW3));
Invalidate(_ButtonRectFor(ARROW4));
Invalidate(_ButtonRectFor(ARROW2));
Invalidate(_ButtonRectFor(fPrivateData->fButtonDown));
bool repeat = _ButtonRectFor(fPrivateData->fButtonDown).Contains(
Invalidate(_ButtonRectFor(fPrivateData->fButtonDown));
Invalidate(_ButtonRectFor(fPrivateData->fButtonDown));