Removing buttons from hero abilities

Hi,
I was wondering if it's possible to prevent the display of hero abilities in the command box once they have been learned. I want to be able to use the space for other ablities and learning abilties is only used to trigger triggers in my map.

Any help would be appreciated.

Edit: Right after I posted this I realized that I could remove the ability with a trigger. Real 'doh!' moment for me >.>

Either that, or you could use an ability without an icon, like most passive item abilities.

Or you could make the ability a disabled spellbook. Come to think of it, maybe you don't need hero abilities at all? It sounds like you just want a menu of icons. Spellbook is your friend.