Board Thread:Support Requests - Getting Technical/@comment-9749219-20130523231946/@comment-5716479-20130524104207

I am not certain what you mean by tab, but there is a good example for how to make use of this feature in tables Help:Collapsing, from here you can build anything you want.

p.s. iirc, don't forget to place a header in that table(the '!' line) because that is where the show/hide button would show.