How to get from an EditPart to its Editor in Eclipse? (Eclipse plug-in development)

Question

I am writing an eclipse plug-in that extends editor. Inside the editor I put some EditParts. From some of these edit parts I need a reference to their encapsulating editor (so that for example, when clicking an instance of MyEditPart, I want to programmatically close the editor).

Please advise on the API to get from an EditPart instance to the Editor it is in.

Thanks.