Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1081
@corneadoug Tested and works well. Further work doesn't need to be
addressed in this PR I think.
By the way, CI build is failing with error
```
INFO] src/components/expandCollapse/expandCollapse.directive.js
[INFO] line 16 col 3 Missing "use strict" statement.
[INFO] line 20 col 55 Strings must use singlequote.
[INFO] line 21 col 54 Strings must use singlequote.
[INFO] line 22 col 52 Strings must use singlequote.
[INFO] line 24 col 46 Strings must use singlequote.
[INFO] line 25 col 38 Strings must use singlequote.
[INFO] line 31 col 10 Missing semicolon.
[INFO] line 19 col 13 '$' is not defined.
[INFO] line 20 col 18 '$' is not defined.
[INFO] line 21 col 17 '$' is not defined.
[INFO] line 22 col 17 '$' is not defined.
[INFO] line 24 col 17 '$' is not defined.
[INFO] line 25 col 19 '$' is not defined.
[INFO]
[INFO] â 13 problems
```
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