Right Click PopupMenus in Java

im trying to get right click menus to come up when they control right click in a JPanel. I researched a bit and was able to develop the code, but for some 开发者_运维问答reason the isPopUpTrigger returns false, any ideas? Thanks!

else if(arg0.getButton() == MouseEvent.BUTTON3 )
            {
                if(controlIsPressed){
                    class PopUpDemo extends JPopupMenu {
                        JMenuItem anItem;
                        public PopUpDemo(){
                            anItem = new JMenuItem("Click Me!");
                            add(anItem);
                        }
                    }
                    if(arg0.isPopupTrigger()){
                        PopUpDemo menu = new PopUpDemo();
                        menu.show(arg0.getComponent(), arg0.getX(), arg0.getY());
                    }
                }

Which method in MouseListener are you calling this in? Depending on which OS, it may be triggered by mousePressed or mouseReleased so you need to call this from both of those methods.