Just by dragging.
I should mention that I have crashed (yes, crashed) the system twice today already. Once by clicking "Calibrate" in the Displays settings panel (color tab), and another time by choosing "Get Mac OS X Software..." from the Apple menu.
In both scenarios, I tried Opt-Cmd-Esc and force-quitting, and in the first case it only locked up tighter, and in the 2nd, the 3-key combo had no effect at all. I ended up with a 'spinning disc' cursor, unable to do anything.
Crash proof my butt....