description method cached?

Doing a seaside app using magritte, within pier, within the glass appliance I created a subclass of MATextInputComponent to do some specific validation, call it FooInputComponent, I changed the old description method to send componentClass: like this descriptionFoo ^MAStringDescription new componentClass: FooInputComponent; selectorAccessor: #foo; label: 'Foo'; priority: 40; yourself However, the change doesn't seem to apply, the container still gets a MATextInputComponent. I placed a halt in descriptionFoo and it never triggers. Is this a caching issue that I can reset? Thanks Joel