A toolbar in the IDE disappears…

Sometimes ago, I reported here that the toolbar icons at the right of the Filter field in the IDE disappears (Windows XP).

Now, I saw it appearing in OS X 10.8.5 / 2014r1.

BUT: it was because I had an empty tab. Once I realize the tab is empty, I closed it and saw the missing toolbar icons and then they re-appears.

Black Magic was not against me that day, after all !

PS: I do not know how to add an empty Tab (and I do not searched how do do that).

Click the + icon at the left side of the tab bar