Hi, I think I encountered an error in allImplementorsOf:, but I am not quite sure and I wanted to run it by you first. If you evaluate (self systemNavigation allSendersOf: #browse) anyOne sourceCode. you get the source as expected. However, if you evaluate: (self systemNavigation allImplementorsOf: #browse) anyOne sourceCode. you get an error. The last snippet used to work just fine in Pharo 1.1.1. I consider it a bug. What do you think? Cheers, Doru -- www.tudorgirba.com "Sometimes the best solution is not the best solution."