I'm on LR 2.1 and have some files I want to delete but I can't get there. The files in question are located in a smart collection. There are two virtual copies and a TIFF. When I select them, either one at a time or all of them, the 'delete' key on my keyboard (I'm on an iMac) does nothing. If I flag them all as 'rejected', I can't remove them via the 'Delete rejected photos' under the 'Photo' menu. What gives?