Github user neykov commented on the pull request:
https://github.com/apache/incubator-brooklyn/pull/484#issuecomment-72463541
Still something weird going on:
* Creating an app with `my_secret` config, there is some unexplained
delay while loading:

* Once loaded the value part of the screen is missing:

* After clicking around the entities and going back, the value is visible:

* After adding a secret sensor (which displays fine), all config values
are blurred:

As for reverse-engineering, I didn't realized the text is a static
"(hidden)", consider it a try for a paranoia joke.
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