virtual bool Pen(Point p, const PenInfo& pn, dword keyflags) {
		if(pn.action==PEN_DOWN){
			if(keyflags&K_SHIFT){
				RectTracker tracker(*this);
				tracker.sync= [=](Rect r) {  };
				tracker.MinSize(Size(-100000,-100000));
				tracker.Track(Rect(p,p));
			}
			else if(keyflags&K_CTRL){
				RectTracker tracker(*this);
				tracker.TrackLine(p.x,p.y);
			}
		}
		
		if(pn.pressure) {
			if((!!pn.pressure == !!pen.pressure) && drawing.GetCount())
				drawing.Top().Add(MakeTuple(pn.pressure, p));
			else
				drawing.Add().Add(MakeTuple(pn.pressure, p));
		}
		pen = pn;
		Refresh();
		return true;
	}