groups Property

// To retrieve:
var groups = instance.get_groups();

            // Get the messenger context and the User object. 
            messengerContext = wl.App.get_messengerContext(); 
            user = messengerContext.get_user(); 
            // Define a handler that detects when the User's groups are changed. 
            user.get_groups().add_collectionChanged(groupsCollectionChanged); 
            
            function groupsCollectionChanged(sender, args)
            { 
                //If the names of the new groups are invalid, remove them from the list and display an alert to the user. 
                newGroups = args.get_newItems(); 
                for (var i=0; i <  newGroups.get_count(); i++) 
                { 
                    if(newGroups(i).isNameValid() == true)
                    { 
                        alert("The group name " + newGroups(i).get_name() + " is not valid."); 
                        user.get_groups().remove(newGroups(i); 
                    } 
                } 
            }