I couldn’t find the menu in question so I’m not sure about the setup.
If you are looking to have a child iframe change the scene of a parent, you can simply call:
If you are looking to have a parent iframe change a child, this requires using the
postMessage call and signaling such that a handler is called on the iframe that can use the Hype API. I think there are some examples of this via searching the forums (though perhaps not exactly doing a scene change).
I believe the global behavior extension project can also help: Hype GlobalBehavior (Custom Behavior Extension)