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"Add new service" action appears only in context menu of already registered service node and not on parent "META-INF Services", "<exported services>" and "<all services>" nodes, it is not possible to add new service via this action. It is also wrong from user's POV, as she probably expects to be able to add new service in context of "META-INF Services" or "<exported services>". Suggested behaviour is to enable "Add new service" action on above mentioned nodes and to add a widget into AddServiceDialog allowing to select service interface. It will be pre-filled if invoked on already existing service node (in this case the interface is known from context of service node).
If services via annotations will make it into next version, UI for services will require some work as well.
Obsolete. Use code completion.