Github user yuri1969 commented on the issue: https://github.com/apache/nifi/pull/2269 About that _close/done/ok_ button, currently the advanced UI is implemented as an `iframe` inside `nfShell`. The close 'X' button is a part of to the `nfShell`. So for closing down the advanced UI you need to close the `nfShell` too. I guess it can be done by traversing to the `nfShell` via the standard `window` object. Is this approach ok? Since it feels, it introduces another coupling element.
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