public:
	virtual bool  Pen(Point p, const PenInfo &pn, dword keyflags);
	virtual void  DoMouseMove(Point p, dword);

protected:
	int				pointer;

RectTracker::RectTracker(Ctrl& master)
{
	pointer=Null; // << ADD THIS IN CONSTRUCTOR

...

bool  RectTracker::Pen(Point p, const PenInfo &pn, dword keyflags){ // ADD Pen() here
	if(IsNull(pointer)) pointer=1;
	if(pointer!=1) return false;

	switch(pn.action){
		case 0:
			DoMouseMove(p, keyflags);
			break;
		case PEN_DOWN:
			LeftDown(p, keyflags);
			break;
		case PEN_UP:
			LeftUp(p, keyflags);
			break;
	}
	return true;
}

void RectTracker::MouseMove(Point mp, dword){ // ADD NEW MouseMove here
	if(IsNull(pointer)) pointer=2;
	if(pointer!=2) return;
	DoMouseMove(mp,0);
}

void RectTracker::DoMouseMove(Point mp, dword) // RENAMED ORIGINAL MouseMove to DoMouseMove
{

... THIS IS THE ORIGINAL MouseMove() code here ...

static bool pendown=false; // ADD
bool GetMouseLeft()   { return pendown || !!(GetKeyStateSafe(VK_LBUTTON) & 0x8000); } // ADD 'pendown ||' here

...

				if(message == WM_POINTERUPDATE && GetPointerPenInfoHistory(pointerId, &hc, ppit)) {
					bool processed = false;
					for(int i = hc - 1; i >= 0; i--) {
						ProcessPenInfo(ppit[i]);
						POINT hp = ppit[i].pointerInfo.ptPixelLocation;
						CurrentMousePos =  hp; // << ADD UPDATING HERE
						ScreenToClient(hwnd, &hp);
						pen.history = (bool)i;
						processed = DoPen(hp);
					}

...

				switch(message) {
				case WM_POINTERDOWN:
					pendown=true; // << ADD set pendown here
					pen.action = PEN_DOWN;
					ClickActivateWnd();
					break;
				case WM_POINTERUP:
					pendown=false; // << ADD set pendown here
					pen.action = PEN_UP;
					break;
				}