Depends on what you want to achieve. You might want to take a look at a way to do it with Glamour in a current Moose image. In a workspace, do-it:
GLMBasicExamples new magritte openOn: GLMMagrittePersonExample sampleData
That shows how to work with announcements on save. The earlier examples are a better way to start understanding how to work with Glamour (and because of the way the examplebrowser is build, the Magritte example doesn't update the list when it is nested):
GLMBasicExamples open
That has several other examples that update on change.