there was 1 dangerous button: it is the "x" button! 2 avoid vanishing of all job in 1 step, remove it is safe;
it's nice if repertoire window remember its position and dimension, I ask 4 those f.;
last but ...
in main window add a button 4 fast open repertoire window.
(rem 4 who is building its own repertoire, repertoire editor is the most used!!!)