How to get a pop-up menu on right click of JTree?

hi
My application consists of a JTree.I am having a 2 root nodes each one have some child nodes.in the first root node what i want is on right click of child node i have to display one option that is enabled and on the second root node what i want is on right click of child node i have to display one option that is disabled..
how to do that
thanks for your reply in advance,

When you are creating your nodes, do node.setUserObject(objectName);
and on right click, do something like this
if (e.isPopupTrigger() == true) {
         selPath = tree.getPathForLocation(e.getX(), e.getY());
      try {
         // If Right Click, Select the Node
         Object[] selectedPath = selPath.getPath();
         DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) selectedPath[selectedPath.length - 1];
         try {
            dataObject = (MyObject) selectedNode.getUserObject(); // Set the Data Object
         } catch (ClassCastException ex) {
                                  ex.printStackTrace();
         // Check for the right click on Framework Node
         if (dataObject.getClass().isInstance(new MyObject()) == true) {
            // Disable the pop-up menu
....

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