Magritte3 description selection

Hi, i have a class Account with some descriptions. Now based on my application state i'm interested to select and display a sub collections of the relative descriptions. In the Magritte 2.0 i redefine the instance description method ( in the example i implemented it with descriptionFor: ) and at this time i select the relative class description and return it asContainer. Example: aMember := Account new. cllDsc:= aMember descriptionFor: #( #update). rsl:= self call: (( cllDsc asComponentOn: aMember ) addValidatedForm ; addMessage: 'Aggiornamento item ' , aMember label ; yourself). Now i work to port the code to Magritte 3. My question is : what is the best solutions to create dynamic selection of the descriptions relative to one instance ? I'm new to Magritte3 and i don't know the engine. Can anyone give me some guidance? Thanks, Dario