Component (DLL) Question

Hello, I was asked for a class to develop a component.

What this component has to have is an interfase and its contract.

So I began with an ActiveX DLL project... How would I develop the interface? Or am I doing the wrong thing? In our classes we were told Components didn't behave like Objects but I have this:

VB Code:

Option Explicit
 
Private Sub Form_Load()
 Dim myComponent As VBToExcel
 Set myComponent = New VBToExcel
 
 myComponent.DoSomething
 
 Set myComponent = Nothing
End Sub

What am I missing? Did I mess it up? :ehh: I mean, the code is working but it shouldn't be done like that, should it?

I have made some research and found this page. I have implemented the Interface as the article says I should...

Article

But I still have this doubt? Is this the right thing to do? Could anyone please answer that question?

What I am saying is that in C++ you make your ISomething.h as your Interface, but is this even done in VB? (Not that I am complaining that the code isn't working or anything, but you know how proffesors can be)

Thanks in advance.