Damien, Ah, I see, the example from the thesis was integrated into the latest Pier. That's probably why you already have it. The main difference that I see from the newest Pier and the code that I entered manually is that the PREditFormCommand class has both readUsing: and write:using: methods in the latest Pier while the code that I entered from the master thesis did not. -Bill ----- Original Message ---- From: Damien Cassou <damien.cassou(a)laposte.net> To: Bill Sun <billksun(a)yahoo.com> Sent: Tuesday, July 25, 2006 12:28:25 AM Subject: Re: Trouble Following Pier Example in Master Thesis Bill Sun wrote: Hi Bill, Your class is already present in my image so you may find your answer into the last Magritte and Pier versions on monticello (repository: http://mc.lukas-renggli.ch/magritte or /pier) If this is still not clear, ask here.