Why can't the tab name changed when I duplicate the form?

I duplicated alot of forms, now when you open them up in a window. The tab name refers to the old form?

Is there anyway to change this? 

Sorry for the problem you are having.

It's actually the Page title which stayed the same with the previous title. I have changed it for you and created a screencast for you so you can get the idea how to do it:

Hope this will help.

If you have any further query, please let us know.