onAnswerCommand and structure change

I like to execute a command in a way that the structure is changed while the command is being executed. If the command is commited I like to advance the structure to another structure. If the command is aborted than I like to return to the structure from where the command has been invoked. Basically I do something like this html anchor goto: (self context structure: self structureWhileCommandIsExecuting command: MyPierCommand new); with: 'do it' ] In MyPierCommand>>doExecute I do at the end self answer: (self context structure: self structureAfterCommandHasBeingCommited ) This way I have chose a structure for command execution and the structure if the command is commited. But on abort it stays where it has been executed (structureWhileCommandIsExecuting). Looking at PRContentsWidget>>onAnswerCommand: aCommand aCommand isNil ifTrue: [ ^ self context: (self context structure: self context structure) ]. [ aCommand execute ] on: MAError do: [ :err | ^ self component errors add: err ]. self context: aCommand answer we see that if aCommand isNil (abort) the structure is nailed to the current one (while executing). Would it be ok to change that so it is answering every time? I simple change would be to change buildComponent: aContext ^ aContext command asComponent onAnswer: [ :value | self onAnswerCommand: value ]; yourself to buildComponent: aContext ^ aContext command asComponent onAnswer: [ :value | value ifNotNil: [ self onAnswerCommand: value ] ifNil: [ aContext command doAnswer ] ]; yourself this way PRCommand>>doAnswer self answer ifNil: [ self answer: (self context structure: self structure) ] would the same but some could overwrite the answer when creating the link what do you think? Norbert