onOpen EventListener lost on Treeitem

	public void render(Treeitem treeItem, Object data, int arg2) throws Exception {

		DefaultTreeNode treeNode = (DefaultTreeNode) data;
		treeItem.setValue(treeNode);
		Treerow tr = treeItem.getTreerow();
		if(tr == null) {
		    tr = new Treerow();
		} else {
		    tr.getChildren().clear();
		}		
		treeItem.appendChild(tr);		
		MyRowData row = (MyRowData)treeNode.getData();
		tr.appendChild(new Treecell());
                // Add my information to the row...
		
		if (!row.isLeaf())) {
			if (!treeItem.isListenerAvailable(Events.ON_OPEN, true)) { 
				treeItem.addEventListener(Events.ON_OPEN, new EventListener() { 
					public void onEvent(Event event) throws Exception {
						Treeitem ti=(Treeitem)event.getTarget();
						DefaultTreeNode dtn=(DefaultTreeNode)ti.getValue();
						MyRowData row = (MyRowData )dtn.getData();
						row.setOpen(((OpenEvent)event).isOpen());
					}
				}); 			
				treeItem.addEventListener(Events.ON_RIGHT_CLICK, new EventListener() { 
					public void onEvent(Event event) throws Exception {
						((Treeitem)event.getTarget()).setSelected(true);
					}
				});
			}
			
			if (tr.getContext()==null) {
				Menupopup popup=new Menupopup();
				popup.setPage(treeItem.getPage());
				popup.setWidth("300px");
	
                                // Add some menus
				Menuitem mnc=new Menuitem("MyMenu");
				mnc.setImage("/images/myimage.gif");
				ComponentsCtrl.applyForward(mnc, "myid.onClick");
				popup.appendChild(mnc);
				
				tr.setContext(popup);
			}
		}
		treeItem.setOpen(row.isOpen()); 
	}