The problem is simply a refresh problem in the software, it’s not something that can be fixed at this time so I’m afraid you have to go with the workaround of having two buttons. Sorry for the inconvenience!
Hi, I was wondering if there a plans to fix that software refresh problem (updating the views and selections while a script is processing) that Lilly mentioned 6 years ago.
http://forums.toonboom.com/toon-boom-animate-family/general-discussion/my-scripting-issues#comment-4604