Hiding panes

Hi,

I was wondering if it is possible to add something to hide panes without closing them. I mean, currently, if I close a pane, the files in this pane move to other opened pane.

For example, I have in a pane my JS and CSS files, and in the other one several HTML files. I would like to hide the HTML pane because I am not working on this page anymore, but I don't want to close them because I might want to check something in it.

Or simply I like to group files, and if I don't work on a group I hide it.