Bug related to WICKET-2657 in 1.4.x branch

[Objelean Alex]

I've tested my code with latest 1.4.x branch version in chrome, and
apparently there is another problem with this:
- if AjaxSubmitLink adds to the target some component to be refreshed, then
it will disappear. This can be reproduced only in Chrome (v 5.. probably the
same problem is with v. 4). In Firefox everything is ok.