Requesting Help

[Bloodlusttwo]

I am currently making a map but i need help. I see on many maps, there is a ability, when clicked it clears all the buttons and replaces them with different ones. Ex.Heros and Empires-Skills

 

[MeteORA]

I dont know the one you say exactly but there is another thing like that. Unit has normal abilities a ability called Spell Book and and item called spell book . When you click on the Spell Book ability it opens more abilities. Look for Spell Book ability in We, You'll understand what i mean.