title: JavaFX : how to close stage from annother controller
body: <p>i'm developing a JavaFX management application, I am in a situation where I need to succeed serval windows (stages) to complete a process, to ensure that the user can go back at any time without losing information (input fields). I don't close the current stage. Good , now i can go back without losing information
  , but I want to know how  can I close all the intermediate stages at the end of process ? when all is done.</p>
  
  <p>More simply i want to know how can i hide or close a stage from annother controller , not its own controller.  or completly another solution to make what i want.</p>