implement add to list for owned collection entities using gwt 2.4 editor framework

I want to change Spring roo gwt samples in order to create a ui that has an addToList feature for entities that have owned collection, which must be saved in owner scenarios.
but in spring roo samples when I put cascade all in roo script, the ui that is created is not suitable for such scenario.
in roo generated sources, they implement a crud scenario for all entities but when i have a weak entity that does not mean without it's owner, I should think of creating a ui that owned collections could be created , saved, updated and deleted in it's owner scenario.

how should i change script roo or change generated sources to provide such ui ?

I want to know how to create a UI like this using Spring Roo:
http://demogwtpeople.appspot.com
and here is Demo Info :
http://c.gwt-examples.com/home/ui/places