Collapse Subwindow?

[RevenantBob]

So I'm able to hide a subwindow, but I'd like to collapse it. Is there an automatic way to do this? Collapse as in it becomes hidden and treated like 0 height but can grow again if shown.

[RevenantBob]

Nevermind, I figured out what I need to do.

[damned]

Nevermind, I figured out what I need to do.

Please share?