Toggleable Combine Fence?

[Zaughi]

I was going to add a combine fence into one of my map projects. I wanted to make it toggleable with a func_button, so another part of the map could be accessed. Anyone know how to do this?

[Corewarp]

Not exactly what you want but:

http://www.interlopers.net/tutorials/18314

Should give you enough insight to make it work yourself.