This is a late response, but I came across this while searching for a solution for my GlideDialogWindow, which worked fine while in Global Scope, but did not work once in its own custom scope.   Sharing my fix for future reference...NB: I was using a...

Is there any way to trigger this with a custom event?   We want to do the putClientData sometime after login, but it doesn't appear to work for any event other than session.established.