Ability Prequistes?

I need a little help on my map. I want to make it so an ability requires an ability before you can research it. (Hero abilities, that is.) Like one skill would require another skill to be level 2 before research.

Just disable all the higher Abilities on Map Init. and then enable one-by-one with triggers when the required skills have been learned

But if I do that will it still show up in their ability list but darkened?

nope it´s hidden, I use this alot in my campaign since some abilitys require you to find a certain item (item combination) or is part of a plot event

Ohh i c...thanks hodi! ^^