Hello again, that is a strange thing, as I just started the app to take some screenshots to show my problem, and now all the custom scripts from the script editor were visible in the pickup window from the add button assignment panel.
If I will be able to reproduce the problem I will come back to you. Sorry for bothering you so far.
Nevertheless, your question made me double check it, so now I know it should be visible there, so in case its not again I will try to fix it by conducting some restart, etc.
