[Seaside] Dumb newbie problem with repeating a call/answer

[Richard Huxton]

I've tried to simplify this as much as possible. A call/answer works 
first time I use it in a session, but not the second.

New class (will eventually be a form)...
WAComponent subclass: #ArchDummyEditor

ArchDummyEditor >> renderContentOn: html
   html anchorWithAction: [ self answer: 'one' ] text: 'link one'.
   html anchorWithAction: [ self answer: 'two' ] text: 'link two'.

Then hack WATaskTest adding two inst vars (dummy foo)...

WATaskTest >> initialize
   dummy := ArchDummyEditor new.

WATaskTest >> foo: f
   foo := f.

WATaskTest >> renderContentOn: html
   self foo: (self call: dummy)
   html text: 'foo = ',foo; break

Go into the seaside test area, select the task test, click "link one" - 
it works, I get "foo = one" on-screen.

Select the task test again, click "link two" - Internal Server Error... 
MessageNotUnderstood: UndefinedObject>>reset. No "debug" link on the screen.

I've added "Transcript show:"s and both #foo and #renderContentOn are 
completing. I can't find what is being sent "reset" - the message finder 
lists hundreds of classes implementing it but not mine or Seaside's 
(afaict).

Anyone got a clue-stick handy?
-- 
   Richard Huxton
   Archonet Ltd