How to create an action event on a button in javafx

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Java

JavaFX

Java8

The button is defined in Class A the scene of Class is being passed to a different class B so the Action Event should work in B's stage. So the Question is how to do it.

What I have tried:

I have tried to do it but the actionevent doesn't work I want to close the scene of A which I passed to the stage of Class B and overwrite another scene from a third class C to the stage of class B but it won't work.

In Other words I have used the stage of class B for the scenes of Class A and C.