#322 Application layout contains dependency on tabbed dialog

[Miro Halas]

Application layout file application.js contains
dependency on functionality provided by tabbed dialogs:

while ((eBottomAreaElement != null)
&& (eBottomAreaElement.className !=
'clsTabPreviewActive')
&& (eBottomAreaElement.className !=
'clsTabPreviewActiveLoaded'))

these two css styles are defined only by tab.css and
therefore this functionality is not generic. Maybe we
should generalize this functionality so we can also
break this dependency between Open Core and Open Patterns.