'How I access objects which I create in scene builder? JAVAFX

For example, I created a grid pane, added text areas into every cell. Now I want to get grid pane as an Object to do something with it in my Controller class? How can I do that?

For example, to get Button you just add ActionEvent parameter and on click you can get an buttton object.

@FXML
protected void restartButton(ActionEvent event) {
    Button btn = (Button) event.getSource();

}
javajavafx


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