gitlabhq/app/views/refs/tree.html.haml

%ul.nav.nav-tabs
  %li
    = form_tag switch_project_refs_path(@project), :method => :get, :class => "project-refs-form", :remote => true do
      = select_tag "ref", grouped_options_refs, :onchange => "$(this.form).trigger('submit');", :class => "project-refs-select"
      = hidden_field_tag :destination, "tree"
      = hidden_field_tag :path, params[:path]
  %li{:class => "#{'active' if (controller.controller_name == "refs") }"}
    = link_to tree_project_ref_path(@project, @ref) do 
      Code

#tree-holder= render :partial => "tree", :locals => {:repo => @repo, :commit => @commit, :tree => @tree}

:javascript
  $(function() { 
    Tree.init();
  });