Set Banana panel custom query

I have created a Banana custom panel, and I want to change dynamically its "custom query" by a system of "select" tag. In this page, I can see that I can find a variable "_d" that contains custom. I can change it by a static variable which I give a value before launch Banana.                                                                             Far in the tutorial, is a comment "Set the additional custom query", but, I am not sure of what I have to replace by my variable (or have I not to touch it?).I decided to look at the filtering pane...Read more