Prevent closing of context menu when showing an alert dialog in JavaFX - javafx

Question

I have a context menu, which contains a CustomMenuItem with some controls. When clicking a button, a dialog shows and the context menu hides automatically. Here is the problem: I would like to prevent the closing of the context menu when the dialog shows. How can I solve this problem?
I already have tracked done the event. When the dialog opens, a FocusUngrabEvent.FOCUS_UNGRAB event is fired, which is handled in PopupWindow. I already tried to add an EventFilter and EventHandler to the context menu for FocusUngrabEvent.FOCUS_UNGRAB and consume the event, but that does not help.
Here an SSCCE demonstrating this problem:
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.CustomMenuItem;
import javafx.scene.control.Label;
import javafx.stage.Stage;
public class PimaryStage extends Application {
#Override
public void start(Stage primaryStage) {
// The button which shows the dialog.
Button button = new Button("Some Button");
button.setOnAction((event)-> {
Alert alert = new Alert(Alert.AlertType.WARNING);
alert.setTitle("Warning");
alert.setHeaderText(null);
alert.setContentText("Some Text");
alert.show();
});
// Custom menu item which contains the button.
CustomMenuItem menuItem = new CustomMenuItem(button);
menuItem.setHideOnClick(false);
// Context menu.
ContextMenu menu = new ContextMenu();
menu.getItems().add(menuItem);
// Label.
Label label = new Label("Click here to open the context menu.");
label.setContextMenu(menu);
// Set the scene and show the stage.
Scene scene = new Scene(label, 300, 250);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}

Answer 1

This worked for me:
#FXML
public void autoShow() {
contextmenu.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent e) {
e.consume();
}
});
}
Place the above method in your controller class and then call it from the initialize method in your controller class:
#Override
public void initialize(URL location, ResourceBundle resources) {
autoShow();
}