[Pharo-project] Odd inconsistency in Seaside One-Click 3.0.7

I was reviewing the Seaside book while refreshing my skills, and I noticed this very strange, trivial, but fundamental bug/inconsistency: http://www.youtube.com/watch?v=2RyREN00Nok (less than 2 minute demo). The issue is hardly worth mentioning, except for totally new users, but I DO wonder what is going on that changes the behavior from the first right-click on the category pane to the second. L -- Squeak from the very start (introduction to Squeak and Pharo Smalltalk for the (almost) complete and compleate beginner). https://www.youtube.com/playlist?list=PL6601A198DF14788D&feature=view_all