c# – How would you write an impact for checking the right way to see if an occasion handler is hooked up to a window?

I’m making an attempt to wrap my head across the answer for the gathering views not increasing problem in .internet maui proven right here on this hyperlink:

https://github.com/CommunityToolkit/Maui/points/1670#issuecomment-2010903416

I perceive all the things else, besides the OnAttachedListenerEffect for the customized expander view.

The creator says: “That property an OnAttachedListener impact that we have discovered helpful to set off an occasion when a view will get hooked up to the window.”

I don’t know how its doing this and want to know the way one thing like that could be written.

Any tips on how to do that will probably be a lot appreciated. Thanks. Sorry if it is a silly query.