JTree nodes which implement Drag&Drop and Mouse Event act incorrect

OS: Red Hat Linux 6.2J Second Edition
Desktop environment: GNOME
J2SE version: 1.3.1_06

JTree nodes which implement Drag&Drop and Mouse Event act incorrect.
When RIGHT click JTree node, drag&drop event runs.
Drag&Drop event should occur only when we keep finger on left button of a mouse.

We observed this problem with Red Hat Linux, and the behavior seems
fine with Windows2000.

Procedure to reproduce the problem:
1) run the sample program (MainFrame.class)
2) right click one of JTree node
3) Drag&Drop event runs

Behavior of Windows and RedHat Linux is different and behavior of
Windows2000 seems correct.


Sample code 1: TreeTest.java
===================================================================
import javax.swing.*;
import javax.swing.tree.TreeSelectionModel;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.DataFlavor;

public class TreeTest extends JTree implements DragGestureListener,
                                               DragSourceListener,
                                               DropTargetListener,
                                               Transferable,
                                               MouseListener{

    public TreeTest(TreeNode top){
        super(top);
        super.addMouseListener(this);
        DragSource dragSource = DragSource.getDefaultDragSource();
        dragSource.createDefaultDragGestureRecognizer(this,
                DnDConstants.ACTION_COPY_OR_MOVE,
                this);
        new DropTarget(this,
                DnDConstants.ACTION_COPY_OR_MOVE,
                this);

    }


    public void dragGestureRecognized(DragGestureEvent e){
        int selRow = getRowForLocation((int)e.getDragOrigin().getX(),
                (int)e.getDragOrigin().getY());

        if(selRow != -1){
            TreePath selPath
                = getPathForLocation((int)e.getDragOrigin().getX(),
                                     (int)e.getDragOrigin().getY());
            e.startDrag(DragSource.DefaultCopyDrop, this , this);
        }
    }

    public Object getTransferData(DataFlavor flavor){
        return new Object();
    }


    public DataFlavor[] getTransferDataFlavors(){
        DataFlavor objFlavor = new DataFlavor("application/x-java-object", "Object");
        DataFlavor[] f = new DataFlavor[1];
        f[0] = objFlavor;
        return f;
    }

    public boolean isDataFlavorSupported(DataFlavor flavor){
        if (flavor.getHumanPresentableName().equals("Object")){
            return true;
        }else{
            return false;
        }
    }



    public void dragEnter(DropTargetDragEvent dtde){}
    public void dragExit(DropTargetEvent dte){}
    public void dragOver(DropTargetDragEvent dtde){}
    public void drop(DropTargetDropEvent dtde){}
    public void dropActionChanged(DropTargetDragEvent dtde){}

    public void mouseClicked(MouseEvent e){}
    public void mouseEntered(MouseEvent e){}
    public void mouseExited(MouseEvent e){}
    public void mousePressed(MouseEvent e){

        int modify = e.getModifiers();
        if( (modify & MouseEvent.BUTTON1_MASK) != MouseEvent.BUTTON1_MASK ) {
            int selRow = getRowForLocation(e.getX(), e.getY());
            if (selRow != -1){
                TreePath selPath = getPathForLocation(e.getX(), e.getY());
                setSelectionPath(selPath);
                JPopupMenu projectMenu = new JPopupMenu();
                JMenuItem createPalette = new JMenuItem("test1");
                JMenuItem setProperty = new JMenuItem("test2");
                projectMenu.add(createPalette);
                projectMenu.add(setProperty);
                projectMenu.show(e.getComponent(), e.getX(), e.getY());
            }
        }
    }
    public void mouseReleased(MouseEvent e){}


    public void dragDropEnd(DragSourceDropEvent dsde){}
    public void dragEnter(DragSourceDragEvent dsde){}
    public void dragExit(DragSourceEvent dse){}
    public void dragOver(DragSourceDragEvent dsde){}
    public void dropActionChanged(DragSourceDragEvent dsde){}


}
===================================================================


Sample code 2: MainFrame.java
===================================================================
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.event.TreeSelectionListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.tree.TreeSelectionModel;
import java.net.URL;
import java.io.IOException;
import javax.swing.JEditorPane;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;

public class MainFrame extends JFrame {


    public MainFrame() {
        super("MainFrame");
        DefaultMutableTreeNode top = new DefaultMutableTreeNode("Top");
        createNodes(top);
        TreeTest tree = new TreeTest(top);
        JScrollPane treeView = new JScrollPane(tree);
        getContentPane().add(treeView, BorderLayout.CENTER);
    }


    private void createNodes(DefaultMutableTreeNode top) {
        DefaultMutableTreeNode test1 = null;
        DefaultMutableTreeNode test2 = null;
        DefaultMutableTreeNode test3 = null;
        DefaultMutableTreeNode test4 = null;
        DefaultMutableTreeNode test5 = null;
        test1 = new DefaultMutableTreeNode("test1");
        test2 = new DefaultMutableTreeNode("test2");
        test3 = new DefaultMutableTreeNode("test3");
        test4 = new DefaultMutableTreeNode("test4");
        test5 = new DefaultMutableTreeNode("test5");
        top.add(test1);
        top.add(test2);
        top.add(test3);
        top.add(test4);
        top.add(test5);
    }

    public static void main(String[] args) {
        JFrame frame = new MainFrame();
 
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
 
        frame.pack();
        frame.setVisible(true);
    }
}

===================================================================