if multiple SWindows are added to the same parent container during the same request, a JavaScript error "Could not find component with id ..." is thrown => AddWindowUpdate needs to override equals() and hashCode(), too
if multiple SWindows are added to the same parent container during the same request, a JavaScript error "Could not find component with id ..." is thrown => AddWindowUpdate needs to override equals() and hashCode(), too

git-svn-id: 5dcc7cd5152275acd4e360c2553cbfd520c77ebf@4306 c8af5dc8-8010-0410-93ac-e0f74e17e1d8

exxcellent/wings3,exxcellent/wings3,exxcellent/wings3