Hi,     when define a description i can into addCondition: block     test one  property of the description ?     For example:    descriptioAddressPrn     ............     addCondition:[:value| ...... propertyAt: #sizeLink = value size]     labelled: ' Error ';     yourself   Where the property is set when create the descriptionContainer         description             ^ self class descriptionContainer,                 self class descriptionAddressPrn beWritable; propertyAt: #sizeLink put:10; yourself Any pointers would be greatly appreciated! Thanks!     Dario _______________________________________________ Magritte, Pier and Related Tools ... https://www.iam.unibe.ch/mailman/listinfo/smallwiki