1. Open a C++-file and add the following code:

   class BaseClass{
   };
   
   class ClassAA : public BaseClass{
   };
   
   class ClassAB : public BaseClass{
   };
   
   class Classaa : public BaseClass{
   };
   
   class Classab : public BaseClass{
   };
   

2. Right-click on "BaseClass" and select "Open Type Hierarchy" from the context menu.
   You'll see this:
   

I think it would make more sense to have the classes in alphabetic order, i.e.:

1. ClassAA
2. Classaa
3. ClassAB
4. Classab