Spellbook orders

We have a problem with a spellbook-ability. We want to know when a unit casts the spellbook and when it cancels it.

A units begins/stops casting a spell dont work.

A unit is issued an order with no target do neither work.

Current order of unit neither works!

What to do? I guess it is not possible :(

There is no way to do that

that sux, well then, lets do it the other way Voi :P

Are you sure, I mean, doesn't spellbook and the cancel have an order Id?
I mean the five number code...

Cancel only has an order id when it is for cancelling training or upgrade, Spell book has an order id, but you can't use it to detect it or order the unit to open it