the right way to update grid

Vaadin 6 / 7 / 8
1

Grid grid = new Grid();
BeanItemContainer container = new BeanItemContainer<>(Type.class);
GeneratedPropertyContainer containerMain;
…
container.addAll(list);
containerMain = new GeneratedPropertyContainer(container);
…
grid.setContainerDataSource(containerMain);

how to update grid with saving states like scroll position and selection?