In PharoDev RC3 open a class browser and go to any class that overrides a method.
For example, TestCase >> assert:
Now, click on the green narrow to go to the super class implementor:
MessageNotUnderstood: TestCase class>>withAllSuperAndSubclassesDo:
The method withAllSuperAndSubclassesDo:� is not in Pharo 1.0 but it is in 1.1
Cheers
Mariano