Show Balance Chart button (missing?)

[Jack via KMyMoney-devel]

I had some difficulty responding to the new bug about showing the  
balance chart for liability accounts.  Namely, I do not see a "Show  
Balance Chart" button anywhere, and I don't see any relevant menu  
choice.  The only way I was actually able to view the chart was to go  
to Settings/Configure Toolbars... and add the button for that action.   
I tried in 5.1.3, as well as a version from master branch.

I didn't want to distract the discussion there by mentioning this, but  
I'm curious if anyone can explain under what conditions such a button  
might appear on the ledger.

Thanks.

Jack