I'm new at Stackoverflow and Javafx (and Java at all), so my question can be stupid.
I have a .fxml file with main window (it's include LineChart) and Controller.java, binded to it. And I need make new window with chart options (color and thickness of line). I'm making window with options by event, binded on menuItem in main window.
So, how I can change properties of chart in main window from options window? I don't understand at all how to get access to LineChart in main window!
This is how I open options window:
 void showSettings(ActionEvent event)
        throws IOException {
    Group root = new Group();
    Stage stage = new Stage();
    AnchorPane frame = FXMLLoader.load(getClass().getResource("options.fxml"));
    root.getChildren().add(frame);
    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}
Can anybody help me?
P.S. Sorry for my bad English level :c
Edit1: I need pass params from new window(options) to already existing (main)!
