NetBeans plugin for JavaFX Version

I wanted to make NetBeans plugin showing JavaFX version(like Figure1) by using JavaFX.
But when I read the article NetBeans NetBeans IDE 7.2 Plugin Quick Start I decided to use Swing with JavaFX(like Figure2)

• Figure 1(This window is created by JavaFX)

• Figure 2(This window is created by Swing JFrame and JFXPanel)

The content that is surrounded with the square of the orange is the JFXPanel.
(FYR:http://docs.oracle.com/javafx/2/swing/swing-fx-interoperability.htm#CHDIEEJE )

At first it was not difficult to develop the plugin thanks to the above article.
After the plugin runs, you see the icon on the toolbar(like Figure3)
You can use any icons when you create a plugin action.

• Figure 3

The problem is when the I click the icon I see the window without the JFXPanel

• Figure 4

I am pretty sure I am doing something wrong.
I hope someone gives me any advice.The whole code is here(tomoTaka01/JavaFXVersionInfo: The plugin sh... - GitHub)
I am looking forward to creating the toolbar by JavaFX!!!

• code1(the code for the icon Action)

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import org.openide.awt.ActionID;
import org.openide.awt.ActionReference;
import org.openide.awt.ActionRegistration;
import org.openide.util.NbBundle.Messages;

@ActionID(
    category = "File",
id = "org.myorg.javafxversioninfo.VersionListener")
@ActionRegistration(
    iconBase = "org/myorg/javafxversioninfo/version.png",
displayName = "#CTL_VersionListener")
@ActionReference(path = "Toolbars/File", position = 0)
@Messages("CTL_VersionListener=JavaFXVersion")
public final class VersionListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
        SwingVersion swingVersion = new SwingVersion();
        swingVersion.main(null);
//        Application.launch(JavaFXVersionDisplay.class);  // this code does not work???
    }
}

• code2(SwingVersion class)

import com.sun.javafx.runtime.VersionInfo;
import java.awt.BorderLayout;
import java.awt.Container;
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.effect.InnerShadow;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

public class SwingVersion {
    private static void initAndShowGui() {
        JFrame jFrame = new JFrame("test");
        final JFXPanel jfxPanel = new JFXPanel();
        jFrame.add(jfxPanel);
        jFrame.setSize(500, 200);
        // JavaFX version by Swing
        String javaFxVer = VersionInfo.getRuntimeVersion();
        JLabel jLabel = new JLabel("JavaFX version(by Swing) is " + javaFxVer);
        Container contentPane = jFrame.getContentPane();
        contentPane.add(jLabel, BorderLayout.PAGE_START);
        jFrame.setVisible(true);
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // this code does not work???
        Platform.runLater(new Runnable() {
            @Override
            public void run() {
                initFX(jfxPanel);
            }
        });
    }
    private static void initFX(JFXPanel fxpanel){
        Scene scene = createScene();
        fxpanel.setScene(scene);
    }
    private static Scene createScene() {
        GridPane grid = new GridPane();
        grid.setAlignment(Pos.CENTER);
        grid.setHgap(10);
        grid.setVgap(10);
        grid.setPadding(new Insets(25));
        // *** for row size
        ColumnConstraints col1 = new ColumnConstraints(250);
        grid.getColumnConstraints().add(col1);
        // Title label
        InnerShadow is = new InnerShadow();
        is.setOffsetX(0.1f);
        is.setOffsetY(0.1f);
        Text scenetitle = new Text("JavaFX Version Display");        
        scenetitle.setEffect(is);
        scenetitle.setFill(Color.AQUA);
        scenetitle.setFont(Font.font("Tahoma", FontWeight.BOLD, 36));
        grid.add(scenetitle, 0, 0, 2, 1);
        // JavaFX version info
        Label l1 = new Label("Version from VersionInfo is ");
        l1.setFont(Font.font(null, FontWeight.NORMAL, 18));
        grid.add(l1, 0, 1);
        final Text t1 = new Text(VersionInfo.getRuntimeVersion());
        t1.setFont(Font.font(null, FontWeight.BOLD, 18));
        grid.add(t1, 1, 1);
        // JavaFX version info
        Label l2 = new Label("Version from property is ");
        l2.setFont(Font.font(null, FontWeight.NORMAL, 18));
        grid.add(l2, 0, 2);
        final Text t2 = new Text(System.getProperty("javafx.runtime.version"));
        t2.setFont(Font.font(null, FontWeight.BOLD, 18));
        grid.add(t2, 1, 2);
        // Java version info
        Label l3 = new Label("Java Version is ");
        l3.setFont(Font.font(null, FontWeight.NORMAL, 18));
        grid.add(l3, 0, 3);
        final Text t3 = new Text(System.getProperty("java.version"));
        t3.setFont(Font.font(null, FontWeight.BOLD, 18));
        grid.add(t3, 1, 3);
        return new Scene(grid, Color.ALICEBLUE);
        
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                initAndShowGui();
            }
        });
    }
}

keep coding...