WAB 3D custom widget Add Shapefile works, but no pop-up

MichaelLev

I created WAB 2.17 3D custom widget to add zipped shapefile. Its code is exactly as in sandbox of esri Javascript API 4.16 code example Create a FeatureLayer from a shapefile. It runs OK and I see the added shapefile both in the 3D scene and in "Layer List" widget.

My questions:

1. If I run esri example or if I copy esri code example into an independent web app, then when I click on an added feature, a pop-up is opened, as expacted.
   But - In my WAB, I have a serious problem - When I click on an added feature, no pop-up is opened.