Thanks for your help. This actually led me in the right direction for resolving the issue. For some reason the map selection was only selecting the top-most graphic. Using the sample you provided as a reference, I was able to setup a map click listener, clear out the existing dataprovider on the ContentNavigator for the map, and repopulate it with all graphics that match at that extent within each graphics layer. Things seem to work as expected! Thanks again.
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