void removeNodes(Set nodes)
void removeNodes(Set nodes, TreeImageDisplay parentDisplay)
    void removeNodes(Set nodes)    {        Iterator i = nodes.iterator();         TreeImageDisplay node;        TreeImageDisplay parent;        DefaultTreeModel dtm = (DefaultTreeModel) treeDisplay.getModel();        while (i.hasNext()) {            node = (TreeImageDisplay) i.next();            parent = node.getParentDisplay();            parent.removeChildDisplay(node);            parent.remove(node);            dtm.reload(parent);        }    }