Getting a coherent behaviour between two extensions of a bundle

I have two extensions in my bundle. The first (A) needs the second (B) OPEN in order to get datas. I have fixed the problem of communication with CSXSEvents.  When the A is open, the B must be open too. But the B must evoluate by herself if the A is closed.
The only solution i have found to get a coherent behaviour is to do "requestOpenExtension(B)"  on the following Event (com.adobe.indesign.Event.AFTER_SELECTION_CHANGED) of A.
Obviously, even if I close those  two extensions and then, I change the selection, the extension B appears again.
How can i  fix the problem? i have thought to close definitely the extension A on closing event of extension B but i'm not familiar with StateChangeEvent events and i'm not sure if it's the right solution. How can I close définitely an extension?
Thanks for help .

A solution which has worked for me in the past is to communicate via CSXS events - your first extension would register a listener for certain event types, and your second extension would dispatch events with that same type. Something like:
// Extension A:
CSXSInterface.getInstance().addEventListener(B_TO_A_EVENT, myEventHandler);
// Extension B:
CSXSInterface.getInstance().dispatchEvent(B_TO_A_EVENT, myCSXSEvent);
If you need two way communication then you can additionally add an event listener in Extension B and dispatch from Extension A.
Hope that helps!

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