Agfdhyk

when I try to initialize the Anchor Pane a strange things happens: if I put the elements in this order I cannot click with the mouse, for example, on the elements of the list.

AnchorPane root = new AnchorPane(listLoader.load(), fieldLoader.load(), textareaLoader.load(), buttonLoader.load(),  menuLoader.load());

But if I write it on this way I'm able to select the items on the list but not the items in the menubar:

AnchorPane root = new AnchorPane(fieldLoader.load(), textareaLoader.load(), buttonLoader.load(),  menuLoader.load(), listLoader.load());

Do you know How should I write the elements to make at least the button, the menu and the list clickable?

This is the full code:

@Override

public void start(Stage stage) throws Exception {

    FXMLLoader listLoader = new FXMLLoader(getClass().getResource("lista.fxml"));

    FXMLLoader textareaLoader = new FXMLLoader(getClass().getResource("textarea.fxml"));

    FXMLLoader fieldLoader = new FXMLLoader(getClass().getResource("textfield.fxml"));

    FXMLLoader menuLoader = new FXMLLoader(getClass().getResource("menubar.fxml"));

    FXMLLoader buttonLoader = new FXMLLoader(getClass().getResource("button.fxml"));



    AnchorPane root = new AnchorPane(listLoader.load(), fieldLoader.load(), textareaLoader.load(), buttonLoader.load(),  menuLoader.load());



    ListController listController = listLoader.getController();

    TextAreaController textareaController = textareaLoader.getController();

    TextFieldController fieldController = fieldLoader.getController();

    MenuBarController menuController = menuLoader.getController();

    ButtonController buttonController = buttonLoader.getController();



    DataModel model = new DataModel();

    listController.initModel(model);

    textareaController.initModel(model);

    fieldController.initModel(model);

    menuController.initModel(model);

    buttonController.initModel(model);



    Scene scene = new Scene(root, 603, 403);

    stage.setScene(scene);

    stage.show();

}

Lista.fxml:

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="mailbox.ListController">

Button.fxml:

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="mailbox.ButtonController">

MenuBar.fxml:

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="mailbox.MenuBarController">

<children>

    <MenuBar fx:id="menuBar" layoutX="0.0" layoutY="0.0">

        <menus>

            <Menu text="File">

                <items>

                    <MenuItem onAction="#elimina" text="Elimina" />

                </items>

            </Menu>

            <Menu text="Cambia Account">

                <items>

                    <MenuItem fx:id="email1" text="filippo@hotmail.it" />

                    <MenuItem fx:id="email2" text="giancarlo@yahoo.it" />

                    <MenuItem fx:id="email3" text="alessandro@gmail.it" />

                </items>

            </Menu>

        </menus>

    </MenuBar>

</children>

Textarea.fxml:

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="mailbox.TextAreaController">

Textfield.fxml:

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mouseTransparent="false" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="mailbox.TextFieldController">

EDIT:
So should I declare more than one Anchor Pane and attach them to a main Anchor Pane?

    AnchorPane root = new AnchorPane();



    AnchorPane lista = new AnchorPane(listLoader.load());

    AnchorPane textarea = new AnchorPane(textareaLoader.load());

    AnchorPane field = new AnchorPane(fieldLoader.load());

    AnchorPane menu = new AnchorPane(menuLoader.load());

    AnchorPane button = new AnchorPane(buttonLoader.load());



    root.getChildren().addAll(lista, textarea, field, menu, button);

EDIT2: This is the output of my program, can I create it with a BorderPane? Because It automatically anchor the elements on the right, left ecc... and for example I cannot put the textfield as you can see in the image

Probably consecutively loaded panes have the same sizes. After loading them you get a stack of panes with the same sizes. In that case only the top most pane (added as last one) is responsive for mouse events. I would suggest to provide correct sizes and anchors for every pane.
If my thesis is incorrect please provide more code.

EDIT: if child1 and child2 had the same sizes only the blue one would be visible but still the red one would be present but underneath and all covered by blue one. It's the same situation with your app. Btw you are misusing AnchorPane. AnchorPane is designated to anchor children.

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.layout.AnchorPane;

import javafx.stage.Stage;



public class AnchorPaneTest extends Application {



    public static void main(String args) {

        launch(args);

    }



    @Override

    public void start(Stage stage) throws Exception {

        AnchorPane anchorPane = new AnchorPane();



        AnchorPane child1 = new AnchorPane();

        child1.setPrefSize(400., 600.);

        child1.setStyle("-fx-background-color: red;");



        AnchorPane child2 = new AnchorPane();

        child2.setPrefSize(400., 300.);

        child2.setStyle("-fx-background-color: blue;");



        anchorPane.getChildren().addAll(child1, child2);



        stage.setScene(new Scene(anchorPane));

        stage.show();

    }

}