import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class EscCrash extends Application {
    Stage stage = null;

    public static void main(String[] args) {
        launch(args);
    }

    public void makeEscapeClosable(final Scene scene) {
        scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
            public void handle(KeyEvent ke) {
                if (ke.getCode() == KeyCode.ESCAPE) {
                    stage.close();
                }
            }
        });
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        stage = primaryStage;
        Button btn = new Button("Button");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                Label label = new Label("Label");
                Stage st = new Stage();
                st.initOwner(stage);
                st.setScene(new Scene(label));
                makeEscapeClosable(st.getScene());
                st.showAndWait();
            }
        });
        stage.setScene(new Scene(new Group(btn)));
        makeEscapeClosable(stage.getScene());
        stage.show();
        stage.setX(stage.getX() - 100);
//        Platform.setImplicitExit(false);
    }
}