GPS flight plan update

I use the GPS API provided in the SDK to read the GPS flight plan in my C++ gauges. It works perfect.I would like to know if I can be notified when there is an update of the GPS flight plan. In other words, when a new flight plan is created or loaded into the FS flight planner.As I don't know how to do this, I keep reading the GPS flight plan once per second to detect any change, but this is not very efficient...Eric