QML/C++ interaction problem

[Willem Ferguson]

I attach an image with some very short code sections. I closely follow 
the Qt app note  "Exposing Attributes of C++ Types to QML" at URL
http://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html
The error message in the black section is standard.
No indication that the QML sees any C++.

In assigning the QML model (see image) I tried several variants including
model: vendorModel                                  (referencing the 
model object)
model: vendorModel.getVendorModel       (i.e. referencing a getter 
function that returns a vendorModel)
model: DownloadManager.vendorModel    (different way of referencing the 
model object)
model: DownloadManager.getVendorModel  (different way of referencing the 
same getter function)

Which is an appropriate way to convince QML to see the Q_PROPERTY?
Kind regards,
willem

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