Unable to add a tag to a GameObject in Unity 3.4

Problem

I create a cube GameObject with in Unity 3.4 and select it. I go to the Inspector and click the Tag drop down menu and select Add Tag… which is the last option. The Tag Manager opens up and I see the Tags option with a right facing arrow next to it. I click it and the arrow points down now and I see:

Size 1
Element 0

What any of that means I have no idea. All I know is that I can not figure out how to add a custom tag to my cube GameObject or even the Main Camera for that matter. I try left, right and middle button clicking but nothing.

The official Unity documentation is out of date (last update was in 2008). See for your self:

Tags
http://unity3d.com/support/documentation/Components/Tags.html

Tag Manager
http://unity3d.com/support/documentation/Components/class-TagManager.html

Closing Thoughts

I think it makes logical sense to update all the documentation if you are going to release a software update. Otherwise beginners get screwed. Or did I find a bug?

So is there a way to add a new custom tag to a GameObject in Unity 3.4?

Change the size field. Size means size of array. Element 0 is the first element in the array. Simply change the size field to something you would like and you should see more elements added.