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namedwindow not defined

Hi, I'm just starting, I made a UWP app with an opencv helper project according to this:

link text

I got the blur example working fine.

I thought I would try HoughCircles based on this: link text and I think it is working but I am struggling with display the results. At the end I have

namedWindow("circles", 1);
imshow("circles", img);

.. but it won't compile, namedWindow and imshow are undefined.if I type "cv::" I get code completion showing loads and loads of things but not namedWindow or imshow.

I'd appreciated some assistance with this, Thanks