what trigger to resupply grenades?

[oterak]

I placed hero unit raynor (commando). he has ability toss grenade which uses charges (starts with 3, max is 10). I assumed the add ammo to magazine trigger would add charges but apparently I'm wrong. So how are we supposed to let our units manually resupply their ability charges?

 

[oterak]

ahh ok i got it - used the charge trigger, duh.