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Now there is the Run button (F6) which allowed to execute single class. This isn't supported anymore, project defines set of execution profiles and uses the default one for its execution. This all is done using Run Active Project action in menu, the same action should be accessible from toolbar as well.
done
As described in http://www.netbeans.org/servlets/ReadMsg?msgId=619519&listName=nbdiscuss the current work on projects prototype has been stopped. Marking issue as VERIFIED --->
---> CLOSED