How to operate the main thread class when PopupScreen is pushed?

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  SerializableAttribute public class TitledPaneExample extends Application {}
  instance of TitledPaneExample private;
  StackPane mainModalDimmer;
  
  /*
  * (non-Javadoc)
  *
  * @see javafx.application.Application #start (javafx.stage.Stage)
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  vb.getChildren () .add new (Label ("1"));
  vb.getChildren () .add (Label ("2")) new;
  vb.getChildren () .add new (Label ("3"));
  vb.getChildren () .add (Label ("4")) new;
  
  Bt1 button = new Button ("bt1");
  BT1.setOnAction (new EventHandler < ActionEvent > () {}
  {} public void handle (ActionEvent event)
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  System.out.println ("bt1 dialog hide? < < < < ");"
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  });
  vb.getChildren () .add (bt1).
  
  layerPane.getChildren () .add (vb);
  
  mainModalDimmer = new StackPane();
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  {} public void showModalMessage (message from node)
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  mainModalDimmer.setCache (true);
  TimelineBuilder
  . Create()
  () .keyFrames
  new KeyFrame (Duration.seconds (1),)
  new EventHandler < ActionEvent > () {}
  {} public void handle (ActionEvent t)
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  }
  }, new KeyValue (mainModalDimmer
  . opacityProperty(), 1.
  Interpolator.EASE_BOTH))) infrastructure)
  . Play();
  }
  
  /**
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  */
  public void hideModalMessage() {}
  mainModalDimmer.setCache (true);
  TimelineBuilder
  . Create()
  () .keyFrames
  new KeyFrame (Duration.seconds (1),)
  new EventHandler < ActionEvent > () {}
  {} public void handle (ActionEvent t)
  mainModalDimmer.setCache (false);
  mainModalDimmer.setVisible (false);
  mainModalDimmer.getChildren () .clear ();
  }
  }, new KeyValue (mainModalDimmer
  . opacityProperty(), 0,.
  Interpolator.EASE_BOTH))) infrastructure)
  . Play();
  }
  
  /**
  @param args
  */
  Public Shared Sub main (String [] args) {}
  Launch();
  }
  
  Dialogue/public class extends TitledPane {}
  private owner of TitledPaneExample = null;
  instance of TitledPane private;
  
  Dialogue (owner of TitledPaneExample, String message) {}
  This.Owner = owner;
  this.parentThreand = Thread.currentThread ();
  This.instance = this;
  this.setExpanded (true);
  this.setText ("Dialog");
  this.setMaxWidth (400);
  this.setPrefWidth (300);
  this.setMinWidth (200);
  
  Label the tx = new Label ("message");
  tx.setTooltip (new Tooltip (message));
  tx.setWrapText (true);
  tx.setContentDisplay (ContentDisplay.LEFT);
  
  Bt button = new Button ("OK");
  bt.setOnAction (new EventHandler < ActionEvent > () {}
  {} public void handle (ActionEvent event)
  masquer();
  }
  });
  
  Sp ScrollPane = new ScrollPane();
  sp.setHbarPolicy (ScrollBarPolicy.AS_NEEDED);
  sp.setVbarPolicy (ScrollBarPolicy.AS_NEEDED);
  sp.setContent (tx);
  
  Hb HBox = new HBox (30);
  hb.setPrefHeight (40);
  hb.setAlignment (Pos.CENTER_RIGHT);
  hb.getChildren () .add (bt);
  
  BP BorderPane = new BorderPane();
  bp.setCenter (sp);
  bp.setBottom (hb);
  
  this.setContent (bp);
  }
  
  {} public void show()
  System.out.println ("dialogue show() 1 > > >");
  
  owner.showModalMessage (instance);
  
  System.out.println ("dialogue show() 2 > > >");
  
  }
  
  public void masquer() {}
  System.out.println ("dialogue masquer() 1 > > >");
  this.owner.hideModalMessage ();
  
  System.out.println ("dialogue masquer() 2 > > >");
  }
  }
  
  }

  I'm also interested in how to do this without the use of a step.

  But, if you are ready to use a step for this, you can create a useful first step (without borders) with its owner being your current stage. Then, you can call the function showAndWait on stage that allows to block the thread of your application. For example, I implemented a DialogStage like this:

  package hs.mediasystem.util;
  
  import javafx.animation.KeyFrame;
  import javafx.animation.KeyValue;
  import javafx.animation.Timeline;
  import javafx.event.EventHandler;
  import javafx.scene.effect.ColorAdjust;
  import javafx.stage.Modality;
  import javafx.stage.Stage;
  import javafx.stage.StageStyle;
  import javafx.stage.Window;
  import javafx.stage.WindowEvent;
  import javafx.util.Duration;
  
  public class DialogStage extends Stage implements Dialog {
  
    public DialogStage() {
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      this.setTitle("MediaSystem-dialog");
  
      initModality(Modality.APPLICATION_MODAL);
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    protected void setParentEffect(Stage parent) {
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      Timeline fadeOut = new Timeline(
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        ),
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        )
      );
  
      parent.getScene().getRoot().setEffect(colorAdjust);
  
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    protected void removeParentEffect(Stage parent) {
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    protected void recenter() {
      Window parent = getOwner();
  
      sizeToScene();
  
      setX(parent.getX() + parent.getWidth() / 2 - DialogStage.this.getWidth() / 2);
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    @Override
    public final void showDialog(final Stage parent, boolean synchronous) {
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      setParentEffect(parent);
  
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        @Override
        public void handle(WindowEvent event) {
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          onShow();
        }
      });
  
      if(synchronous) {
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      }
      else {
        show();
      }
    }
  
    protected void onShow() {
    }
  
    @Override
    public void close() {
      removeParentEffect((Stage)getOwner());
      super.close();
    }
  }
  

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