[Pharo-users] Extending Calypso

Hi, Are there any examples (documentation) how to extend Calipso? I have tried to create a simple (demo) method group, but I miss something, because it is not called. I have created three subclasses of: ClyMethodGroup (with #name and #includesMethod:), ClySingleMethodGroupProvider (with #methodGroupClass), and ClyEnvironmentPlugin (with #collectMethodGroupProvidersFor:). What do I miss? Let’s say that I want a new method group that displays all methods of a selected class that include substring ‘foo’. Thanks! Juraj