NativeScript: Cannot get nativeView from N view (iOS)

I am loading a {N} view from a file using Loader:

var view = builder.load({
    path: "~/Views/Slides",
    name: "slider-view"
});

Then i need to convert this view to UIView to add it programmatically to another UIView:

var obj = <any>view;
obj._onAttached();
viewController.view = obj.ios;

Doing some debugging i can see that obj._subViews contains the {N} UI elements but i get a white screen.

It seems obj.ios, obj._view and obj._nativeView are null at this point.

Any ideas?

I am using the same in Android and it works with the difference that in android i am passing context to _onAttached.

obj._onAttached(application.android.currentContext);
container.addView(obj.android);

In this case obj.android contains the native view.

Thanks.