I would like to promote a Support Center article on the subject, which I heavily updated with new code examples and implementation considerations after receiving a similar customer request yesterday.
As I found later when searching our support database, many users wanted this specific customization in nested ListViews, mainly not to overload end-users with a separate root DetailView in this inner context. I must say that I saw similar reasoning for MasterDetailMode = ListViewAndDetailView too (for this scenario, we offered a solution like this one).
I personally prefer the 2nd solution from this article, but I must admit that both solutions could be simpler, ideally. Please let our team know if you experienced a similar need and clarify exactly where and why as well as how you are solving it now. With that, we will be a better position to consider further improvements. Thanks in advance, guys!
