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According to issue #200427 there should be implemented History tab also for all Coherence DDs till the Coherence move to the stable UC or into the standard distrubtion. See also this wiki page for more information: http://wiki.netbeans.org/EditorHistoryTab
Not important right now since not all configurators are using XML XAM model for now. Targeting to next release.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss