REACTIONS: Scrolling box with folded tracks/relative location of selected track

Hi John
Hey, I am totally stuck...I have everything working nicely except, when there are folded tracks, the box move nicely but the selected track disappears into the folded track.
It could be easily done if I could interrogate the box for the relative position of the selected track (within the box). Im a bit confused by the reactions reference;
Obviously not written for CSS but I got the idea with your other explanations earlier on but...

The Track number for Tracks 'Relative to Session Box position' are input inside the set of the parenthesis ( ) like so: track [self.track_num(2)].mute Selected Tracks do not require a Track number to be input.

'Selected tracks do not require..."

How can I get the selected track index within the box?

self.st_rel_pos = self.selected_track_idx() - self._session.track_offset() -1 is fine when there are no folded tracks

Welcome your wisdom on this one