Folks
I'm having trouble getting OmniGraffle Pro (5.1) to show/hide layers using actions in the browse tool. I have a canvas with 4 layers, 3 of which are shared layers. When I try to assign an action ("shows or hides layers") to an object on one of the shared layers, the only layers available to show/hide are the current layer -- i.e. neither of the other two shared layers or the non-shared layer appear in the list of layers.

(The file I'm working on is a website wireframe, and I'm trying to get one of the navigation items (objects) on the primary nav (one of the shared layers) to show/hide a roll-over state (another shared layer). Instead it can only show/hide itself.)

Am I doing something wrong? Should this be possible?
Thanks for any help!
Cheers
Jeremy