How to use options in the Dropdown menu UI?

I have a dropdown with a couple different options, and each one should make one menu visible and the others invisible. I was able to set up the dropdown just fine using unity UI, but I can’t find any options for making something happen when you click on each option. I assumed it would work like a button, how does it work?

You can manage the events with the “On value changed” section:

http://docs.unity3d.com/Manual/script-Dropdown.html

create a script with a function that will hide the other menus, attach it to the dropdown object. then call that function on value changed event, inside the inspector