What happens to tab index when you remove one?

What happens to tab index when you remove one?

Hello,
I have a tab control with 10 tabs. I have them numbered from 0 to 9.
If I remove tab #7, what happens to the index of tabs 8 and 9?
Are they converted in tabs 7 and 8? Or they mantain their index number for future operations (select, disable, ...)?

I've looked to the tab documentation and doesn't say nothing about that.

TIA
-Alex-