Initialization command [closed]

Question

I noticed in the Cell > Cell properties menu an item I assume was recently added, but I really wouldn't know for sure (8.0.4/Win here). It's called Initialization Command:

Nothing about it to be found in my documentation center. Neither does it seem to be in the online reference:

Any idea what this is supposed to do? As far as I can see its effect is the same as the Initialization Cell menu item.

Quartic

I can say, that under MacOSX-x86-64 this menu entry is not available. A quick search brings me only to the Workbench Doc under reference.wolfram.com/workbench/index.jsp?topic=/… – Czerny

In my v.8.0.4 under Windows I have no Initialization Command. – Trainbearer

Do you have any packages installed that might be adding this? I don't see it, and it seems unlikely to be the sort of thing that would be given a keyboard shortcut. – Infeasible

In my v.8.0.4 under Macintosh, there is indeed an Initialization Command with the same shortcut. I cannot distinguish it from the Initialization Cell command, which it sets. – Deductible

@brett I thought I hadn't but then I remembered I installed a package to investigate an answer on this question: #5186343 . I'll check ASAP. Not at home right now – Quartic

@BrettChampion : yow were right, the culprit was the [Sidebar package][1] that I installed long ago and that I forgot about since. On a different note: the 4th menu item in my installation ("deployed") also differs from the one in the docs ("active") even after removing Sidebar. [1]: #5186343 – Quartic

I think you should close this question and/or post your comment above as an answer and Accept it. – Burkhalter