_DrawArrow
void _DrawArrow(BView* view, BPoint tip, BSize size,
_DrawArrow(view, tip, BSize(10, 10), BSize(5, 5), color, true);
_DrawArrow(view, tip + BPoint(-0.5f, 0), BSize(9, 8),
_DrawArrow(innerRect);
void _DrawArrow(BRect innerFrame);
_DrawArrow(innerRect);
void _DrawArrow(BRect innerFrame);