Why disappears the JavaFX content on my TopComponent?

I've got a problem that maybe is caused by a lack of understanding in some principles of wether the Netbeans Platform(7.1.2) or JavaFX 2. I wanted to add a `JFXPanel` with a very simple `Scene` to a Swing `JPanel` that is a child of a TopComponent. I achieved this by the following code: ``` public accexTopComponent() { initComponents(); setName(Bundle.CTL_accexTopComponent()); setToolTipText(Bundle.HINT_accexTopComponent()); putClientProperty(TopComponent.PROP_CLOSING_DISABLED, Boolean.TRUE); //Begin of my code myFX = new JFXPanel(); //myFX is a static JFXPanel Platform.runLater(new Runnable() { @Override public void run() { myFX.setScene(new Scene(ButtonBuilder.create().minHeight(40.0).minWidth(40.0).build())); } }); jPanel1.add(myFX); } ``` This compiles without a problem and a JavaFX `Button` is displayed when i show the `TopComponent` for the very first time. But as soon as the component is hidden and shown again, the JavaFX `Button` disappears while the other children still are visible. Why does the JavaFX content disappear? Edit: I now include the source of the whole TopComponent. I guess that's all you need to test it for yourself. I didn't change any other file. ``` /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package de.jeed.nbgan.accexplorer; import java.awt.Color; import javafx.application.Platform; import javafx.embed.swing.JFXPanel; import javafx.scene.Scene; import javafx.scene.control.ButtonBuilder; import javafx.scene.text.TextBuilder; import javafx.scene.web.WebView; import javafx.scene.web.WebViewBuilder; import org.netbeans.api.settings.ConvertAsProperties; import org.openide.awt.ActionID; import org.openide.awt.ActionReference; import org.openide.windows.TopComponent; import org.openide.util.NbBundle.Messages; /** * Top component which displays something. */ @ConvertAsProperties(dtd = "-//de.jeed.nbgan.accexplorer//accex//EN", autostore = false) @TopComponent.Description(preferredID = "accexTopComponent", //iconBase="SET/PATH/TO/ICON/HERE", persistenceType = TopComponent.PERSISTENCE_ALWAYS) @TopComponent.Registration(mode = "explorer", openAtStartup = true) @ActionID(category = "Window", id = "de.jeed.nbgan.accexplorer.accexTopComponent") @ActionReference(path = "Menu/Window" /* * , position = 333 */) @TopComponent.OpenActionRegistration(displayName = "#CTL_accexAction", preferredID = "accexTopComponent") @Messages({ "CTL_accexAction=accex", "CTL_accexTopComponent=Konten-Explorer", "HINT_accexTopComponent=Durchsuchen von Abteilungen und Konten" }) public final class accexTopComponent extends TopComponent { static JFXPanel myFX; public accexTopComponent() { initComponents(); setName(Bundle.CTL_accexTopComponent()); setToolTipText(Bundle.HINT_accexTopComponent()); putClientProperty(TopComponent.PROP_CLOSING_DISABLED, Boolean.TRUE); myFX = new JFXPanel(); Platform.runLater(new Runnable() { @Override public void run() { myFX.setScene(new Scene(ButtonBuilder.create().minHeight(40.0).minWidth(40.0).build())); } }); jPanel1.add(myFX); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); jPanel1.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED)); jPanel1.setLayout(new java.awt.GridBagLayout()); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(54, 54, 54) .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 193, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(153, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(33, 33, 33) .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 193, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(74, Short.MAX_VALUE)) ); }// </editor-fold> // Variables declaration - do not modify private javax.swing.JPanel jPanel1; // End of variables declaration @Override public void componentOpened() { // TODO add custom code on component opening } @Override public void componentClosed() { // TODO add custom code on component closing } void writeProperties(java.util.Properties p) { // better to version settings since initial version as advocated at // http://wiki.apidesign.org/wiki/PropertyFiles p.setProperty("version", "1.0"); // TODO store your settings } void readProperties(java.util.Properties p) { String version = p.getProperty("version"); // TODO read your settings according to their version } } ``` In my case, this `TopComponent` is part of a Component called AccountExplorer which references JavaFX and is referenced by a plain NB Platform Application.