Как получить как выбранный, так и не выбранный вид JCheckBox из LAF

У меня проблема, потому что я пытаюсь получить оба изображения JCheckbox, выбранные и не выбранные до сих пор. Мне удалось получить значок из UIManager, но, к сожалению, у него нет отмеченной версии? Я видел, что есть художники, которые рисуют эти значки, но если я запускаю следующий код, он дает мне NPE.

p = (Painter) UIManager.get("CheckBox[Enabled].iconPainter");
BufferedImage selected = new BufferedImage( 20, 20, BufferedImage.TYPE_INT_ARGB ) ;
p.paint((Graphics2D) selected.getGraphics(), null, 20, 20);

Кто-нибудь может помочь мне с этим?

Обновлено:

В основном p имеет значение null после метода get.

КУЧА:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at addlayer.AddLayerUI.initOwn(AddLayerUI.java:47)
    at addlayer.AddLayerUI.<init>(AddLayerUI.java:28)
    at addlayer.AddLayerUI$1.run(AddLayerUI.java:136)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

КОД:

package addlayer;

import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import javax.swing.Icon;
import javax.swing.Painter;
import javax.swing.UIManager;

public class AddLayerUI extends javax.swing.JFrame {

    public AddLayerUI() {        
        initComponents();
        initOwn();
    }
    
    private void initOwn(){
        Icon icn ;
        icn = UIManager.getIcon("CheckBox.icon") ; //Works but gives only unchecked version of the check box, i need checked as well

        Painter p;

        p = (Painter) UIManager.get("CheckBox[Selected].iconPainter"); // returns null

        BufferedImage selected = new BufferedImage( 20, 20, BufferedImage.TYPE_INT_ARGB ) ;
        p.paint((Graphics2D) selected.getGraphics(), null, 20, 20);
    };
    
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate = "collapsed" desc = "Generated Code">                          
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("AddLayer - TatukGIS DK11 sample");
        setIconImage(Toolkit.getDefaultToolkit().getImage(getClass().getResource("/resources/icon.png")));
        setSize(new java.awt.Dimension(800, 600));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 800, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 601, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>                        

    public static void main(String args[]) {
        /* Set the Windows look and feel */
        //<editor-fold defaultstate = "collapsed" desc = " Look and feel setting code (optional) ">
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(AddLayerUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(AddLayerUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(AddLayerUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(AddLayerUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>


        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new AddLayerUI().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    // End of variables declaration                   
}