Docking Option in Presentation Director is grayed out

[jgsx]

I am running Vista on my x60s. I am using the docking station with my x60s.

All that I want is for when I plug my x60s into my docking station, it automatically uses the external VGA and sets it to 1280x1024.

It seems simple enough. In Presentation Director there is an option called

When Notebook is docked, Immediately apply this display scheme:

My problem is that that option is grayed out. I tried both on and off the dock, and it never lets me click that option.

Any suggestions?