BlockUI - unblock some elements on a page?

BlockUI - unblock some elements on a page?

Hi,

I need to unblock some specific input elements (INPUT, SELECT, BUTTON) on a blocked page. I would assume using ids. 

It's to be able to open a second dialog (my own) on top of a BlockUI (page) dialog. Now all controls in the second dialog are blocked. I want to selectively unblock them, while all other controls on the page are still blocked.
Is that possible?

Thx