@Override
    public void setSelectedItems(final List<T> selectedItems) {
        clear(false);
        if (selectedItems != null) {
            for (T t : selectedItems) {
                setSelected(t, true, new SelectionType(), false);
            }
        }
    }
Get a list of all selected items.
stroom-core-client-widget/src/main/java/stroom/widget/util/client/MultiSelectionModelImpl.java