add child's form closing event #2

Question

Vulpes as far it concerns tabs name update: the reason that I am thinking such a thing is because I want to assign in the same tab string a new tabpage without closing the initial one. For a single user this will be as from the initial tabpage it goes to a new tabpage by using the same tab and not opening a new one. Something like the categories of running applications in windows( not the same thought). That's why I mentioned to update tabs name. 

Do you think is it possible?

P.S. I opened a new thread cause the initial one prints an error. ( http://www.c-sharpcorner.com/Forums/Thread/118328/add-childs-form-closing-event.aspx )