Channel Problems

so in my td i have an ability that is based off of channel that i gave to a tower. i want this tower to automatically cast it when the cooldown is up. so i have:

when a unit attacks
attcking unit is equal to nether drake
order attacking unit to channel

but all it does is make it so the tower doesnt attack unless you order it to or if the spell is in cooldown. Does anyone know how to fix this?

Well, did you change the spell's orderstring/orderid?

ohh no i didnt. but i just did and i got it to work. thanks!

post demomap.

channel wont cast if you changed orderbase\string.

Well apparently it did work.