Render another view's index within a create/update form view

I have an index that call a typical create/update view.

Within these, the _form uses bootstrap Tabs, the 1st one renders the views ActiveForm, but on the 2nd tab I need to render the index for another related view.

As such, I used

this->render(…)

and it does display.

My issue is if I try to filter the data, no matter what I try in save the main form and closes, or render the main form on the 2nd tab instead of reloading the referenced index view. How do I get pjax to work with the 2nd view?