Attached there's a page and corresponding controller. The grid has a big GroupsModel, so the page has a scrollbar. If you scroll down to the bottom you can see a button, if you press it, the model is updated via setModel() method. The page than suddenly scroll to the top, instead of staying at the bottom. Under certain circumstances it's annoying for the user.
Maybe the best way to dinamically update model is using a BindingGroupsListModel but I don't understand how to use it....