What is the type Hierarchy panel ?

I dont see nothing ?
I suposse I can see the components of a vector ? or a class ?
Context button -> open type hierarchy does nothing ?
Any idea ?

You should be able to see the inheritance tree for a class. If the class does not inherit, and is not base class for any other, then there is no Hierarchy to show.

And there is some utility so view the components of a class (that is to say, without going to the file when it is saved)
Thanks