The pen is too thick in memory DC! How can I get single pixel pen?

[zspirit]

I am using MM_ANIOSTROPIC mode in memory device context. I create a single pixel pen but it is too thick. I than tried to set just one pixel and that one pixel is also just thick! How can I use just a single pixel pen? You can see in the attach image the text drawn is so big.

#define BMP_WIDTH		400 
#define BMP_HEIGHT		200

void CDrawDlg::Draw(CDC * pDC)
{
	CBitmap bitmap;
	bitmap.CreateCompatibleBitmap(pDC, BMP_WIDTH, BMP_HEIGHT);

	CDC dcMem;
	dcMem.CreateCompatibleDC(pDC);

	CBrush brush (RGB(0,0,255));
	CBitmap * pOldBitmap = dcMem.SelectObject(&bitmap);

	BITMAP BM;
	bitmap.GetBitmap(&BM);

	dcMem.FillRect(CRect (0, 0, BM.bmWidth, BM.bmHeight), &brush);


	dcMem.SetMapMode(MM_ANISOTROPIC);
	dcMem.SetViewportExt(BMP_WIDTH, BMP_HEIGHT);
	dcMem.SetWindowExt(400 * 4, 200 * 4);
	
	// select a single pixel pen
	CPen pen(PS_SOLID | PS_COSMETIC, 0, RGB(255,0,0));
	//CPen pen;
	//pen.CreateStockObject(BLACK_PEN);
	CPen* oldPen =  dcMem.SelectObject(&pen);

	dcMem.SetPixel(0, 100 , RGB(255, 0, 0)); // a test, even this one pixel is just too thick in the output!


	dcMem.TextOut(0,0, _T("(0,0)")); // draw something at the new center
	dcMem.TextOut(30,30, _T("(30,30)"));

	dcMem.MoveTo(0, 0);
	dcMem.LineTo(BMP_WIDTH, BMP_HEIGHT);

 
	pDC->BitBlt(50, 50, BM.bmWidth, BM.bmHeight, &dcMem, 0, 0, SRCCOPY);

	dcMem.SelectObject(pOldBitmap);
	dcMem.SelectObject(oldPen);
}

If I change the call to dcMem.SetWindowExt(400, 200); than everything is drawn correctly in correct sizes. I just don't want text to scale per MM_ANISOTROPIC mode and use fixed 1 pixel ones. It works in regular dc but not so in memory dc. Any pointers please?