I found this in the manual:
Choose View > Show Multiclip Angles, so that there’s a checkmark next to it.
Note: If no sequence is open, choosing the Show Multiclip Angles option has no effect. In this case, you always see the Viewer on the external video monitor.
Is this what you've mapped?
Jerry
Apple Certified Trainer
Author: "Jerry Hofmann on Final Cut Pro 4" Click
here
8-Core 3.0 Intel Mac Pro, Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D, AJA Io HD, 17" MBP, Matrox MXO, CD's