reloadRoot = true;
    void clearTree()    {        DefaultTreeModel dtm = (DefaultTreeModel) treeDisplay.getModel();        TreeImageDisplay root = (TreeImageDisplay) dtm.getRoot();        root.removeAllChildren();        root.removeAllChildrenDisplay();        buildEmptyNode(root);        dtm.reload();        collapsePath(root);        if (!model.isMainTree()) loadGoIntoTree();    }