PRContentsWidget swallowing errors

Hi, I've noticed that non-validation errors are trapped by the code in PRContentsWidget>>#onAnswerCommand: aCommand Can anyone anticipate any problems catching MAError rather than Error, so that non-validation errors are propagated as normal and validation errors are displayed. Currently the code reads: onAnswerCommand: aCommand aCommand isNil ifTrue: [ ^ self context: (self context structure: self context structure) ]. [ aCommand execute ] on: Error do: [ :err | ^ self component errors add: err ]. self context: aCommand answer I'd like to change Error to MAError Have I missed anything? Nick