How to choose a widget from constructor script?

I have an actor where is choosable material and audio, but I don’t know how to make choosable the widget.
I tried many things in the constructor scrip without results.
Does anybody knows how to do this?
I attach screen capture of constructor script and event graph.

Constructor script

Event graph

You can choose what type of feature it will be discrete, continuous or string. We can see the new dataset with Data Table widget bluestacks