Problem with JMenu, JPopupMenu [HELP]

I am having a problem with JPopupMenu.
I create a simple JTree. when the right to display a JPopupMenu of JTree.
When the JPopupMenu is show up again I want to click on a JTree node then takes two clicks of the mouse select the node. If you remove this line "UIManager.setLookAndFeel (UIManager.getSystemLookA ndFeelClassName ());" then click only once.
If you want to use "UIManager.setLookAndFeel (UIManager.getSystemLookA ndFeelClassName ());"
How they must.

Code:

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import static java.awt.event.InputEvent.CTRL_DOWN_MASK;
import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.*;
import javax.swing.tree.*;

public class TreePopup {
        JTree tree = new JTree();
        JPopupMenu popup;

        public TreePopup() {
                popup = new JPopupMenu();
                popup.setInvoker(tree);
                PopupHandler handler = new PopupHandler(tree, popup);
                popup.add(getMenuItem("Add child", handler, 'I'));
                popup.add(getMenuItem("Add sibling", handler, 'M'));
                popup.addSeparator();
                popup.add(new JMenuItem("New"));
                popup.add(new JMenuItem("Open"));
                popup.add(new JMenuItem("Copy"));
                popup.add(new JMenuItem("Cut"));
        }

        private JMenuItem getMenuItem(String s, ActionListener al, char c) {
                JMenuItem menuItem = new JMenuItem(s);
                menuItem.setAccelerator(KeyStroke.getKeyStroke(c, CTRL_DOWN_MASK));
                menuItem.setActionCommand(s.toUpperCase());
                menuItem.addActionListener(al);
                return menuItem;
        }

        private JScrollPane getTreeComponent() {
                tree.add(popup);
                expand(new TreePath(tree.getModel().getRoot()));
                return new JScrollPane(tree);
        }

        @SuppressWarnings("unchecked")
        private void expand(TreePath path) {
                TreeNode node = (TreeNode) path.getLastPathComponent();
                if (node.getChildCount() >= 0) {
                        java.util.Enumeration e = node.children();
                        while (e.hasMoreElements()) {
                                TreeNode n = (TreeNode) e.nextElement();
                                expand(path.pathByAddingChild(n));
                        }
                }
                tree.expandPath(path);
        }

        public static void main(String[] args) throws ClassNotFoundException,
                        InstantiationException, IllegalAccessException,
                        UnsupportedLookAndFeelException {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                TreePopup test = new TreePopup();
                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(test.getTreeComponent());
                f.setSize(400, 400);
                f.setLocation(200, 200);
                f.setVisible(true);
        }
}

class PopupHandler implements ActionListener {
        JTree tree;
        JPopupMenu popup;
        Point loc;

        public PopupHandler(JTree tree, JPopupMenu popup) {
                this.tree = tree;
                this.popup = popup;
                tree.addMouseListener(ma);
        }

        public void actionPerformed(ActionEvent e) {
                String ac = e.getActionCommand();
                TreePath path = tree.getPathForLocation(loc.x, loc.y);
                // System.out.println("path = " + path);
                // System.out.printf("loc = [%d, %d]%n", loc.x, loc.y);
                if (ac.equals("ADD CHILD"))
                        addChild(path);
                if (ac.equals("ADD SIBLING"))
                        addSibling(path);
        }

        private void addChild(TreePath path) {
                DefaultMutableTreeNode parent = (DefaultMutableTreeNode) path
                                .getLastPathComponent();
                int count = parent.getChildCount();
                DefaultMutableTreeNode child = new DefaultMutableTreeNode("child "
                                + count);
                DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
                model.insertNodeInto(child, parent, count);
        }

        private void addSibling(TreePath path) {
                DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
                                .getLastPathComponent();
                DefaultMutableTreeNode parent = (DefaultMutableTreeNode) node
                                .getParent();
                int count = parent.getChildCount();
                DefaultMutableTreeNode child = new DefaultMutableTreeNode("child "
                                + count);
                DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
                model.insertNodeInto(child, parent, count);
        }

        private MouseListener ma = new MouseAdapter() {
                private void checkForPopup(MouseEvent e) {
                        if (e.isPopupTrigger()) {
                                loc = e.getPoint();
                                popup.show(tree, loc.x, loc.y);
                        }
                }

                public void mousePressed(MouseEvent e) {
                        checkForPopup(e);
                }

                public void mouseReleased(MouseEvent e) {
                        checkForPopup(e);
                }

                public void mouseClicked(MouseEvent e) {
                        checkForPopup(e);
                }
        };
        PropertyChangeListener propertyChangeListener = new PropertyChangeListener() {

                @Override
                public void propertyChange(PropertyChangeEvent evt) {

                }
        };
}

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You have omitted one vital detail: since the problem arises only with the SystemLookAndFeel, you need to tell us what system(s) you have tested this on (Windows/Windows classic/Linux/Mac).

Add a line after setLookAndFeel

Code:

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System.out.println(UIManager.getLookAndFeel());

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Report here what that prints on your system.

db

result line code

Code:

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System.out.println(UIManager.getLookAndFeel());

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[The Microsoft Windows Look and Feel - com.sun.java.swing.plaf.windows.WindowsLookAndFeel]

Detail

Code:

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public static void main(String[] args) throws ClassNotFoundException,
                        InstantiationException, IllegalAccessException,
                        UnsupportedLookAndFeelException {
                System.out.println(UIManager.getLookAndFeel());
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                System.out.println(UIManager.getLookAndFeel());

                //TreePopup test = new TreePopup();
                //JFrame f = new JFrame();
                //f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                //f.add(test.getTreeComponent());
                //f.setSize(400, 400);
                //f.setLocation(200, 200);
                //f.setVisible(true);
        }
RESUTL
[The Java(tm) Look and Feel - javax.swing.plaf.metal.MetalLookAndFeel]
[The Microsoft Windows Look and Feel - com.sun.java.swing.plaf.windows.WindowsLookAndFeel]

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thank