Spell book, damn it, we'll always have troubles (!)

[Pharaoh_]

Well, I found out that Spell book cannot be detected when opened.
The events
Unit - A unit is issued an order with no target
Unit - A unit starts the effect of an ability
Unit - A unit uses an item
just don't work. So, is there any way I can detect when the spell book is opened and when it is closed?
Note: One way to close a spell book is by hitting Escape. Well, we mostly hit the button Cancel instead, so, I would need a more efficient way to detect it, rather than using "Player X skips a cinematic sequence".