Dominique,
Thanks for your response. I had thought of your approach, and I may end up implementing it if I have to. It just seems kind of 'kludgy' to have to fake out the map control that way.
Another similar approach would be to replace the original FlareClusterer with a custom clusterer; since that would give me access to the list of clustered graphics, I could easily flag those equipmentPins that were clustered so I would know not to draw their info symbols. The problem with that is that I would then have to replicate the actions of the FlareClusterer's 'spin-up' symbol, which I quite like, but don't want to have to re-invent.
I keep going back to the idea that the FlareClusterer (or any clusterer) must have to do SOMETHING to make the Graphics it is clustering disappear from the map, and that that something should be detectable. I've tried checking the Graphic's symbol, its opacity, its inclusion on the GraphicLayer, etc.... nothing seems to work.
I'm still hoping that one of the ESRI programmers (or some other knowledgeable person) will see this and just tell me what they do to hide the Graphic being clustered.
Thanks again,
JB