JavaFX always on top

package at.kevinschmid;
 
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.stage.Stage;
 
import javax.swing.JDialog;
 
public class Start extends javafx.application.Application {
   public static void main( String[] args ) {
      launch(args);
   }
 
   @Override
   public void start( final Stage stage ) throws Exception {
      final JDialog jDialog = new JDialog();
      final Scene scene = new Scene(new Group());
      final JFXPanel fxPanel = new JFXPanel();
      Platform.runLater(new Runnable() {
         @Override
         public void run() {
            fxPanel.setScene(scene);
         }
      });
      jDialog.add(fxPanel);
      jDialog.setAlwaysOnTop(true);
      jDialog.setVisible(true);
   }
}