Adding topic/service to concert

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Hi there, I want to set up a multimaster environment with the rocon package, especially the concert.

Is there a way to add a topic or a service to a running rocon concert? For example if I start the concert like in the this tutorial :http://wiki.ros.org/chatter_concert/Tutorials/indigo/Chatter%20Concert%20-%20Distributed I imagine something, like the way rocon gateways offer with flipping. Something you can easily do using the console.

Thank you very much!