Defend

I searched the forums but didn't really see this touched upon. I'm trying to detect when one of my heroes toggles a slightly modified Defend ability on or off, but I can't get it to do either. Defend does count as an ability, right?

I'm using:
A unit owned by Player 1(Red) Begins casting an ability

It doesn't seem to ever detect Defend on or off. Am I doing something totally stupid?

Try detecting the orderstring, I think they are "defend" and "undefend" Use an isued order, because defend casts instantly anyways.

It worked, many thanks Hunter =D