Hi Andrei,thank you for your really fast answer!Cheers,Matteo2016-10-04 16:20 GMT+02:00 Andrei Chis <chisvasileandrei@gmail.com>:Hi Matteo,If you look, for example at��RestartDebugAction, there is onthe class side a method #gtStackDebuggingActionFor: that��has the annotation <gtStackDebuggingAction>.To attach actions to the stack (proceed, resume, step into)��the debugger looks for subclasses of DebugAction that have��class side methods annotated with gtStackDebuggingAction.These methods can optionally receive the debugger instance��as an argument. However you can also only have simplemethods like 'PeelToFirstDebugAction class>>#gtActionType'Cheers,AndreiOn Tue, Oct 4, 2016 at 4:10 PM, Matteo Marra <gallonba21@gmail.com> wrote:Hello,I'm working on the Pharo debugger, and I wanted to add a button with new functionality just besides the buttons "Proceed" "restart" ...Is there an easy way to do it? Which is the class that I have to Modify/Extend in order to do that?I tried to look around the methods and I found where DebugSession is created, but I didn't see any clear reference to the UI or to how is constructed in it.Thank you in advance,Matteo