I have searched all the documentation, examples and forums but wasn't able to find a similarity there was one in FixedHeader forums but the answer was incorrect.
I have a request of the functionality for FixedHeader extension to work inside a vertically scroll-able table container, I mean while I want to scroll a container of the table other than the whole window scrolling and want the table head to be fixed inside that container hope you be understood.

Thanks,
Nasir