Created attachment 24274 [details] Patch with implementation.
Applied in r815935 Thanks, Yegor
Reverted in svn r816006 I rolled this patch back (and re-opened this ticket) because there are two problems: Firstly, the interface EvaluationWorkbook is marked "For POI internal use only" and as such it should not be directly used by the public API of POI (in this case CreationHelper). Secondly, it is not clear how this change is useful because there is no test-case or example code supplied. Can you supply an explanation of what you are trying to do? I'm sure we can find a way that doesn't expose POI's internals.
It looks like there might have been alternate ways to solve the problem. I'm resolving this as WONTFIX. Please re-open if you're able to address the issues mentioned above.