Memento don't work on my component when clic on cancel button

Hi All, i work with Squeak and Magritte. I have create my personal component "SUAddress" subclass of MAElementComponent. And define the relative MAAddressDescription subclass of MAElementDescription with methods: kind ^ OrderedCollection defaultComponentClasses ^Array with: SUAddress After i define in TestClass with: descriptionAddress based on MAAddressDescription on addressData and descriptionText based on MAStringDescription on textData. Now when call: anTestClass asComponent addValidateForm; addMessage: 'message' ; yourself all work fine. The problem is when in the form i do change on my component and after i clic the cancel button. In this case the addressData result update to the change do in the form, and not to the last correct state. The textData in this case work fine. Where i wrong ? Any pointers would be greatly appreciated! Thanks! Dario