You should change your #tracks method to
tracks ^tracks ifNil:[tracks:=OrderedCollection new] or tracks tracks ifNil:[self initializeTracks] ^tracks initializeTracks tracks:=OrderedCollection new. Then you don't have to worry about the implementation of #tracks: changing in the future if you want to do something else with/in it. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html
