changing a magritte description dynamically

Hi, I have a form that's using generated via Magritte descriptions. I'd like to be able to change the label on one of the fields dynamically. I thought I'd found the solution by overriding #description on the instance-side and editing the field's description as in: description | description pricePerUnitDescription | self halt. description := super description. pricePerUnitDescription := description detect: [:each| each accessor readSelector == #pricePerUnit]. self addCurrencyToDescriptionLabel: pricePerUnitDescription. ^ description However it seems that the description is cached so this method is rarely called. Any thoughts on how to dynamically change the label in a magritte field greatly received. Thanks Nick