Simple filtering

Say we have some movies displayed in MyVideoNav. If we want to filter by genre, we have to open screen menu, then select genre filter, dialog opens, then select genre, then accept.

I just want to have a button on MyVideoNav (that shows a custom Library Node), that clicked will show only Horror movies. How to do that? (Not my ultimate goal, but solves the problem).

I have two bad ideas for that: reopen MyVideoNav sourced from my addon and, even worse, automatically manipulate all these windows/controls hiding them in process.

How to do that in a more civilised way?