Hiding an Ability button

[StoDaBest]

Hello,
Can anyone help me with hiding an ability button once it's clicked and completed, just like a weapon/armor upgrade: it disapears once researched.
And also can you help with showing a second ability button that will be replacing the first one?
Please help!
Thanks!

 

[Arkless]

You need to add a requirement with your condition in the "show" field. If you can't figure it out I can provide an example when I've got a bit more time.

edit: To show the second ability, add a requirement that has "not" and the same condition in the "show" field.

 

[ZeroPoints]

what arkless says is correct its the requirements you add
Use is for when an ability can be used
show is when the ability is shown
look at the requirements for the melee matches that are on the terran upgrades or zergs that helped me
also sc2mapster has lots of helpful info