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I have a JavaFX application which has only one FXML file. In this file I have one AnchorPane which has a StackPane inside it. Here is the screenshot: When I start this application, I want to resize StackPane automatically with the AnchorPane. Thus; StackPane will get the current avaliable width and height automatically. At the moment when I resize the application, AnchorPane is being resized automatically but StackPane stays as his fixed size. How can I resize the StackPane automatically and make it fully stretched inside its parent panel? My Code Main.java package app; import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage; public class Main extends Application { public static void main(String[] args) { Application.launch(args); } @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("Main.fxml")); Scene scene = new Scene(root,800,600); scene.getStylesheets().add(this.getClass().getResource("/app/style1.css").toExternalForm()); stage.setScene(scene); stage.show(); } } MainController.java package app; import java.net.URL; import java.util.ResourceBundle; import javafx.fxml.FXML; import javafx.fxml.Initializable; import javafx.scene.layout.AnchorPane; import javafx.scene.layout.StackPane; public class MainController implements Initializable { @FXML private AnchorPane anchorPane; @FXML private StackPane stackPane; @Override public void initialize(URL url, ResourceBundle rb) { stackPane.setPrefSize(anchorPane.getPrefWidth(), anchorPane.getPrefHeight()); //didn't work } } Main.fxml <

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