I thought it would be nice if it was possible to have hovering effect on StackPanelLayout header so I created an issue for that (issue nuber is 4561, or direct link http://code.google.com/p/google-web-toolkit/issues/detail?can=2&q=4561&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary&id=4561) and submitted a patch. It would be nice if somebody from the gwt team had a look at this...
/Marko -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
