Dual screen problem in opensuse 11.1

Hi
I have a problem with tetting up another Screen to my Laptop. I try to do it with the options you have in Yast(openSuse11.1) but it didn’t work.

After I configured the second monitor, I tested it. But my screen on my laptop turned black, and the other monitor displayed the desktop, instead to incrase the desktop to two monitors.

I don’t know how to fix that.

I would like to use y second monitor like you can in Windows.

I hope somebody knows how you can do that.
Thanks.