Vaadin components do not have that kind of identifiers, so implementing the proposed functionality would be up to the developer. In any case, many Vaadin components do not send their visible state to the server (e.g. the Table doesn’t send reorder or column hide events) so there would be nothing to store even if the components had an ID.
Of course, the proposed functionality isn’t impossible to develop. If you feel the feature should be a part of the core framework, please add an enhancement request at
http://dev.vaadin.com
, and our dev team will take a look at it 