Capture BP and Item Master "VCR" navigation event

If a BP or Item Master Data record appears that contains notes in the "Details" tab, I'd like a message box to come up alerting the user to this fact. Seems like it would be fairly simple. I can do this when a BP or Item is brought up from a orange arrow without a problem. However, the tricky part seems to be trapping the navigation button event when the user navigates through the master data using the "VCR" buttons. I've not yet found the correct event to trap to do this reliably AFTER the master data loads from the VCR button press. Any ideas or advice would be appreciated.

Thanks,

Greg