Adding abilities and charges via items

[PrisonLove]

How would add abilities, and add charges for that ability to units via picking up an item. I want exactly what they do in the Castanar mission (secret mission) from campaign.

Basically this is what happens:
-You have a unit with no abilities
-Your unit picks up a grenade item
-The grenade ability is added to your unit with 3 charges
-If you pick up another grenade item, the charges of your grenade ability increases by 3
-If you use the grenade ability, your charges decrease by 1 (obviously)
-When you use all of the charges, the ability is grayed out (or possibly removed, I haven't decided which yet)

This sort of thing has to happen for several different item-types.

Does anybody know how to do something like this? I want to make a survival-type map that uses this kind of system.

 

[mrzwach]

Try looking at the campaign mission in the editor (open a map, go to the campaign tab) and looking at how they did it. You should be able to mimic it, though they might use triggers as well.

 

[PrisonLove]

I didn't know you could just open up campaign maps. I figured it was like wc3 where they were stored in the mpg and couldn't just be opened. I'll go take a look.