Is ther a mono button on the master buss?

I am switching over from Cubase SX to LE 5 and I am used to there being a button on the master buss to switch from stereo to mono. I dont see one in LE5. I read through the manual to see what the options where , but could not find anything. Can someone point me in the right direction?
Thank you!

There is none.

Well that is depressing. I was really liking that mono/stereo button. Very handy when mixing.