Clone
toggle_branch.js.erb
var li = $('li#cms_page_<%=@page.id%>');
li.find('.item .toggle').first().toggleClass('open');

<% if session[:cms_page_tree].member?(@page.id.to_s) %>
  if(!li.find('ul')[0]) {
    li.append('<ul><%= escape_javascript(render :partial => "index_branch", :collection => @page.children) %></ul>');
    $.CMS.enable_sortable_list();
  }
<% else %>
  li.find('ul').remove();
<% end %>